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  • Conceptual inheritance implementation

    - by TheSENDER
    Hi there, I'm writing a spatial data structure and I have a doubt about what's the best NODE implementation. According to my design I have an abstract node entity and three classes which inherit from it: EMPTYNODE, FULLNODE, INTERNALNODE. The first one has no particular data. The second one has 1 reference to a generic element. The third one has 2 references to other nodes. I have found several ways to implement this situation (that I have already coded) but I can't decide what's the best. The first solution that I have found is to use a single class Node that potentially performs all the operation in this way: private static class Node { private Elem elem = null; private Node left = null, right = null; public Elem getElem() { assert isFull(); return elem; } public boolean isEmpty() { return elem == null && left == null; } public boolean isFull() { return elem != null; } public boolean isInternal() { return elem == null && left != null; } } The second solution is to write an explicit division by classes where every class offers only its methods. Obviously in this way we are obliged to perform several casts to the node objects. private static abstract class Node { public abstract boolean isEmpty(); public abstract boolean isFull(); public abstract boolean isInternal(); } private static class FullNode extends Node{ private ITriangle elem; @Override public boolean isEmpty() { return false; } @Override public final boolean isFull() { return true; } @Override public final boolean isInternal() { return false; } public Elem getElem() { return elem; } } The third one solution is to use the inheritance allowing every classes to offer all the methods, but the object type should by check by "isEmpty()" and similar methods. In case of wrong call we'll throw an exception. private static abstract class Node { public abstract boolean isEmpty(); public abstract boolean isFull(); public abstract boolean isInternal(); public abstract Elem getElem(); } private static class Empty extends Node{ @Override public boolean isEmpty() { return true; } @Override public final boolean isFull() { return false; } @Override public final boolean isInternal() { return false; } @Override public Elem getElem() { throw new AssertionError(); } } What do you think about these three solutions? Which one would you use? Any other ideas? Thanks for your help. Every idea will be appreciated.

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  • WP7 databinding displays int but not string?

    - by user1794106
    Whenever I test my app.. it binds the data from Note class and displays it if it isn't a string. But for the string variables it wont bind. What am I doing wrong? Inside my main: <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> <ListBox x:Name="Listbox" SelectionChanged="listbox_SelectionChanged" ItemsSource="{Binding}"> <ListBox.ItemTemplate> <DataTemplate> <Border Width="800" MinHeight="60"> <StackPanel> <TextBlock x:Name="Title" VerticalAlignment="Center" FontSize="{Binding TextSize}" Text="{Binding Name}"/> <TextBlock x:Name="Date" VerticalAlignment="Center" FontSize="{Binding TextSize}" Text="{Binding Modified}"/> </StackPanel> </Border> </DataTemplate> </ListBox.ItemTemplate> </ListBox> </Grid> </Grid> in code behind: protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e) { MessageBox.Show("enters onNav Main"); DataContext = null; DataContext = Settings.NotesList; Settings.CurrentNoteIndex = -1; Listbox.SelectedIndex = -1; if (Settings.NotesList != null) { if (Settings.NotesList.Count == 0) { Notes.Text = "No Notes"; } else { Notes.Text = ""; } } } and public static class Settings { public static ObservableCollection<Note> NotesList; static IsolatedStorageSettings settings; private static int currentNoteIndex; static Settings() { NotesList = new ObservableCollection<Note>(); settings = IsolatedStorageSettings.ApplicationSettings; MessageBox.Show("enters constructor settings"); } notes class: public class Note { public DateTimeOffset Modified { get; set; } public string Title { get; set; } public string Content { get; set; } public int TextSize { get; set; } public Note() { MessageBox.Show("enters Note Constructor"); Modified = DateTimeOffset.Now; Title = "test"; Content = "test"; TextSize = 32; } }

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  • C++ Template const char array to int

    - by Levi Schuck
    So, I'm wishing to be able to have a static const compile time struct that holds some value based on a string by using templates. I only desire up to four characters. I know that the type of 'abcd' is int, and so is 'ab','abc', and although 'a' is of type char, it works out for a template<int v> struct What I wish to do is take sizes of 2,3,4,5 of some const char, "abcd" and have the same functionality as if they used 'abcd'. Note that I do not mean 1,2,3, or 4 because I expect the null terminator. cout << typeid("abcd").name() << endl; tells me that the type for this hard coded string is char const [5], which includes the null terminator on the end. I understand that I will need to twiddle the values as characters, so they are represented as an integer. I cannot use constexpr since VS10 does not support it (VS11 doesn't either..) So, for example with somewhere this template defined, and later the last line template <int v> struct something { static const int value = v; }; //Eventually in some method cout << typeid(something<'abcd'>::value).name() << endl; works just fine. I've tried template<char v[5]> struct something2 { static const int value = v[0]; } template<char const v[5]> struct something2 { static const int value = v[0]; } template<const char v[5]> struct something2 { static const int value = v[0]; } All of them build individually, though when I throw in my test, cout << typeid(something2<"abcd">::value).name() << endl; I get 'something2' : invalid expression as a template argument for 'v' 'something2' : use of class template requires template argument list Is this not feasible or am I misunderstanding something?

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  • How to update a TextView on ButtonClick with Spinner(s) values

    - by source.rar
    Hi, I am trying to populate a TextView based on the current selected options in 3 Spinner(s) but cant seem to figure out how to retrieve the selected values from the Spinners to invoke the update function with. Here is my current code (quite messy but I'm just learning Java :)), public class AgeFun extends Activity { private String[] dayNames; private String[] yearArray; private final static int START_YEAR = 1990; private static TextView textDisp; private Button calcButton; private static Spinner spinnerDay, spinnerYear, spinnerMonth; private static ArrayAdapter<?> monthAdapter, dayAdapter, yearAdapter; private int year, month, day; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); year = 2000; month = 1; day = 1; textDisp = (TextView) findViewById(R.id.textView1); calcButton = (Button) findViewById(R.id.button); calcButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { // Perform action on clicks AgeFun.updateAge(year, month, day); } }); // Month spinner spinnerMonth = (Spinner) findViewById(R.id.spinnerFirst); monthAdapter = ArrayAdapter.createFromResource( this, R.array.monthList, android.R.layout.simple_spinner_item); monthAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); spinnerMonth.setAdapter(monthAdapter); // Day spinner dayNames = new String[31]; for(int i =1; i <= 31; ++i) { dayNames[i-1] = Integer.toString(i); } spinnerDay = (Spinner) findViewById(R.id.spinnerSecond); dayAdapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, dayNames); spinnerDay.setAdapter(dayAdapter); // Year spinner yearArray = new String[40]; for(int i =0; i < 40; ++i) { yearArray[i] = Integer.toString(START_YEAR+i); } spinnerYear = (Spinner) findViewById(R.id.spinnerThird); yearAdapter = new ArrayAdapter<CharSequence>(this, android.R.layout.simple_spinner_item, yearArray); spinnerYear.setAdapter(yearAdapter); updateAge(2000,1,1); } private static void updateAge(int year, int month, int day) { Date dob = new GregorianCalendar(year, month, day).getTime(); Date currDate = new Date(); long age = (currDate.getTime() - dob.getTime()) / (1000 * 60 * 60 * 24) / 365; textDisp.setText("Your are " + Long.toString(age) + " years old"); } } Any help with this would be great. TIA

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  • C#/.NET Little Wonders: The ConcurrentDictionary

    - by James Michael Hare
    Once again we consider some of the lesser known classes and keywords of C#.  In this series of posts, we will discuss how the concurrent collections have been developed to help alleviate these multi-threading concerns.  Last week’s post began with a general introduction and discussed the ConcurrentStack<T> and ConcurrentQueue<T>.  Today's post discusses the ConcurrentDictionary<T> (originally I had intended to discuss ConcurrentBag this week as well, but ConcurrentDictionary had enough information to create a very full post on its own!).  Finally next week, we shall close with a discussion of the ConcurrentBag<T> and BlockingCollection<T>. For more of the "Little Wonders" posts, see the index here. Recap As you'll recall from the previous post, the original collections were object-based containers that accomplished synchronization through a Synchronized member.  While these were convenient because you didn't have to worry about writing your own synchronization logic, they were a bit too finely grained and if you needed to perform multiple operations under one lock, the automatic synchronization didn't buy much. With the advent of .NET 2.0, the original collections were succeeded by the generic collections which are fully type-safe, but eschew automatic synchronization.  This cuts both ways in that you have a lot more control as a developer over when and how fine-grained you want to synchronize, but on the other hand if you just want simple synchronization it creates more work. With .NET 4.0, we get the best of both worlds in generic collections.  A new breed of collections was born called the concurrent collections in the System.Collections.Concurrent namespace.  These amazing collections are fine-tuned to have best overall performance for situations requiring concurrent access.  They are not meant to replace the generic collections, but to simply be an alternative to creating your own locking mechanisms. Among those concurrent collections were the ConcurrentStack<T> and ConcurrentQueue<T> which provide classic LIFO and FIFO collections with a concurrent twist.  As we saw, some of the traditional methods that required calls to be made in a certain order (like checking for not IsEmpty before calling Pop()) were replaced in favor of an umbrella operation that combined both under one lock (like TryPop()). Now, let's take a look at the next in our series of concurrent collections!For some excellent information on the performance of the concurrent collections and how they perform compared to a traditional brute-force locking strategy, see this wonderful whitepaper by the Microsoft Parallel Computing Platform team here. ConcurrentDictionary – the fully thread-safe dictionary The ConcurrentDictionary<TKey,TValue> is the thread-safe counterpart to the generic Dictionary<TKey, TValue> collection.  Obviously, both are designed for quick – O(1) – lookups of data based on a key.  If you think of algorithms where you need lightning fast lookups of data and don’t care whether the data is maintained in any particular ordering or not, the unsorted dictionaries are generally the best way to go. Note: as a side note, there are sorted implementations of IDictionary, namely SortedDictionary and SortedList which are stored as an ordered tree and a ordered list respectively.  While these are not as fast as the non-sorted dictionaries – they are O(log2 n) – they are a great combination of both speed and ordering -- and still greatly outperform a linear search. Now, once again keep in mind that if all you need to do is load a collection once and then allow multi-threaded reading you do not need any locking.  Examples of this tend to be situations where you load a lookup or translation table once at program start, then keep it in memory for read-only reference.  In such cases locking is completely non-productive. However, most of the time when we need a concurrent dictionary we are interleaving both reads and updates.  This is where the ConcurrentDictionary really shines!  It achieves its thread-safety with no common lock to improve efficiency.  It actually uses a series of locks to provide concurrent updates, and has lockless reads!  This means that the ConcurrentDictionary gets even more efficient the higher the ratio of reads-to-writes you have. ConcurrentDictionary and Dictionary differences For the most part, the ConcurrentDictionary<TKey,TValue> behaves like it’s Dictionary<TKey,TValue> counterpart with a few differences.  Some notable examples of which are: Add() does not exist in the concurrent dictionary. This means you must use TryAdd(), AddOrUpdate(), or GetOrAdd().  It also means that you can’t use a collection initializer with the concurrent dictionary. TryAdd() replaced Add() to attempt atomic, safe adds. Because Add() only succeeds if the item doesn’t already exist, we need an atomic operation to check if the item exists, and if not add it while still under an atomic lock. TryUpdate() was added to attempt atomic, safe updates. If we want to update an item, we must make sure it exists first and that the original value is what we expected it to be.  If all these are true, we can update the item under one atomic step. TryRemove() was added to attempt atomic, safe removes. To safely attempt to remove a value we need to see if the key exists first, this checks for existence and removes under an atomic lock. AddOrUpdate() was added to attempt an thread-safe “upsert”. There are many times where you want to insert into a dictionary if the key doesn’t exist, or update the value if it does.  This allows you to make a thread-safe add-or-update. GetOrAdd() was added to attempt an thread-safe query/insert. Sometimes, you want to query for whether an item exists in the cache, and if it doesn’t insert a starting value for it.  This allows you to get the value if it exists and insert if not. Count, Keys, Values properties take a snapshot of the dictionary. Accessing these properties may interfere with add and update performance and should be used with caution. ToArray() returns a static snapshot of the dictionary. That is, the dictionary is locked, and then copied to an array as a O(n) operation.  GetEnumerator() is thread-safe and efficient, but allows dirty reads. Because reads require no locking, you can safely iterate over the contents of the dictionary.  The only downside is that, depending on timing, you may get dirty reads. Dirty reads during iteration The last point on GetEnumerator() bears some explanation.  Picture a scenario in which you call GetEnumerator() (or iterate using a foreach, etc.) and then, during that iteration the dictionary gets updated.  This may not sound like a big deal, but it can lead to inconsistent results if used incorrectly.  The problem is that items you already iterated over that are updated a split second after don’t show the update, but items that you iterate over that were updated a split second before do show the update.  Thus you may get a combination of items that are “stale” because you iterated before the update, and “fresh” because they were updated after GetEnumerator() but before the iteration reached them. Let’s illustrate with an example, let’s say you load up a concurrent dictionary like this: 1: // load up a dictionary. 2: var dictionary = new ConcurrentDictionary<string, int>(); 3:  4: dictionary["A"] = 1; 5: dictionary["B"] = 2; 6: dictionary["C"] = 3; 7: dictionary["D"] = 4; 8: dictionary["E"] = 5; 9: dictionary["F"] = 6; Then you have one task (using the wonderful TPL!) to iterate using dirty reads: 1: // attempt iteration in a separate thread 2: var iterationTask = new Task(() => 3: { 4: // iterates using a dirty read 5: foreach (var pair in dictionary) 6: { 7: Console.WriteLine(pair.Key + ":" + pair.Value); 8: } 9: }); And one task to attempt updates in a separate thread (probably): 1: // attempt updates in a separate thread 2: var updateTask = new Task(() => 3: { 4: // iterates, and updates the value by one 5: foreach (var pair in dictionary) 6: { 7: dictionary[pair.Key] = pair.Value + 1; 8: } 9: }); Now that we’ve done this, we can fire up both tasks and wait for them to complete: 1: // start both tasks 2: updateTask.Start(); 3: iterationTask.Start(); 4:  5: // wait for both to complete. 6: Task.WaitAll(updateTask, iterationTask); Now, if I you didn’t know about the dirty reads, you may have expected to see the iteration before the updates (such as A:1, B:2, C:3, D:4, E:5, F:6).  However, because the reads are dirty, we will quite possibly get a combination of some updated, some original.  My own run netted this result: 1: F:6 2: E:6 3: D:5 4: C:4 5: B:3 6: A:2 Note that, of course, iteration is not in order because ConcurrentDictionary, like Dictionary, is unordered.  Also note that both E and F show the value 6.  This is because the output task reached F before the update, but the updates for the rest of the items occurred before their output (probably because console output is very slow, comparatively). If we want to always guarantee that we will get a consistent snapshot to iterate over (that is, at the point we ask for it we see precisely what is in the dictionary and no subsequent updates during iteration), we should iterate over a call to ToArray() instead: 1: // attempt iteration in a separate thread 2: var iterationTask = new Task(() => 3: { 4: // iterates using a dirty read 5: foreach (var pair in dictionary.ToArray()) 6: { 7: Console.WriteLine(pair.Key + ":" + pair.Value); 8: } 9: }); The atomic Try…() methods As you can imagine TryAdd() and TryRemove() have few surprises.  Both first check the existence of the item to determine if it can be added or removed based on whether or not the key currently exists in the dictionary: 1: // try add attempts an add and returns false if it already exists 2: if (dictionary.TryAdd("G", 7)) 3: Console.WriteLine("G did not exist, now inserted with 7"); 4: else 5: Console.WriteLine("G already existed, insert failed."); TryRemove() also has the virtue of returning the value portion of the removed entry matching the given key: 1: // attempt to remove the value, if it exists it is removed and the original is returned 2: int removedValue; 3: if (dictionary.TryRemove("C", out removedValue)) 4: Console.WriteLine("Removed C and its value was " + removedValue); 5: else 6: Console.WriteLine("C did not exist, remove failed."); Now TryUpdate() is an interesting creature.  You might think from it’s name that TryUpdate() first checks for an item’s existence, and then updates if the item exists, otherwise it returns false.  Well, note quite... It turns out when you call TryUpdate() on a concurrent dictionary, you pass it not only the new value you want it to have, but also the value you expected it to have before the update.  If the item exists in the dictionary, and it has the value you expected, it will update it to the new value atomically and return true.  If the item is not in the dictionary or does not have the value you expected, it is not modified and false is returned. 1: // attempt to update the value, if it exists and if it has the expected original value 2: if (dictionary.TryUpdate("G", 42, 7)) 3: Console.WriteLine("G existed and was 7, now it's 42."); 4: else 5: Console.WriteLine("G either didn't exist, or wasn't 7."); The composite Add methods The ConcurrentDictionary also has composite add methods that can be used to perform updates and gets, with an add if the item is not existing at the time of the update or get. The first of these, AddOrUpdate(), allows you to add a new item to the dictionary if it doesn’t exist, or update the existing item if it does.  For example, let’s say you are creating a dictionary of counts of stock ticker symbols you’ve subscribed to from a market data feed: 1: public sealed class SubscriptionManager 2: { 3: private readonly ConcurrentDictionary<string, int> _subscriptions = new ConcurrentDictionary<string, int>(); 4:  5: // adds a new subscription, or increments the count of the existing one. 6: public void AddSubscription(string tickerKey) 7: { 8: // add a new subscription with count of 1, or update existing count by 1 if exists 9: var resultCount = _subscriptions.AddOrUpdate(tickerKey, 1, (symbol, count) => count + 1); 10:  11: // now check the result to see if we just incremented the count, or inserted first count 12: if (resultCount == 1) 13: { 14: // subscribe to symbol... 15: } 16: } 17: } Notice the update value factory Func delegate.  If the key does not exist in the dictionary, the add value is used (in this case 1 representing the first subscription for this symbol), but if the key already exists, it passes the key and current value to the update delegate which computes the new value to be stored in the dictionary.  The return result of this operation is the value used (in our case: 1 if added, existing value + 1 if updated). Likewise, the GetOrAdd() allows you to attempt to retrieve a value from the dictionary, and if the value does not currently exist in the dictionary it will insert a value.  This can be handy in cases where perhaps you wish to cache data, and thus you would query the cache to see if the item exists, and if it doesn’t you would put the item into the cache for the first time: 1: public sealed class PriceCache 2: { 3: private readonly ConcurrentDictionary<string, double> _cache = new ConcurrentDictionary<string, double>(); 4:  5: // adds a new subscription, or increments the count of the existing one. 6: public double QueryPrice(string tickerKey) 7: { 8: // check for the price in the cache, if it doesn't exist it will call the delegate to create value. 9: return _cache.GetOrAdd(tickerKey, symbol => GetCurrentPrice(symbol)); 10: } 11:  12: private double GetCurrentPrice(string tickerKey) 13: { 14: // do code to calculate actual true price. 15: } 16: } There are other variations of these two methods which vary whether a value is provided or a factory delegate, but otherwise they work much the same. Oddities with the composite Add methods The AddOrUpdate() and GetOrAdd() methods are totally thread-safe, on this you may rely, but they are not atomic.  It is important to note that the methods that use delegates execute those delegates outside of the lock.  This was done intentionally so that a user delegate (of which the ConcurrentDictionary has no control of course) does not take too long and lock out other threads. This is not necessarily an issue, per se, but it is something you must consider in your design.  The main thing to consider is that your delegate may get called to generate an item, but that item may not be the one returned!  Consider this scenario: A calls GetOrAdd and sees that the key does not currently exist, so it calls the delegate.  Now thread B also calls GetOrAdd and also sees that the key does not currently exist, and for whatever reason in this race condition it’s delegate completes first and it adds its new value to the dictionary.  Now A is done and goes to get the lock, and now sees that the item now exists.  In this case even though it called the delegate to create the item, it will pitch it because an item arrived between the time it attempted to create one and it attempted to add it. Let’s illustrate, assume this totally contrived example program which has a dictionary of char to int.  And in this dictionary we want to store a char and it’s ordinal (that is, A = 1, B = 2, etc).  So for our value generator, we will simply increment the previous value in a thread-safe way (perhaps using Interlocked): 1: public static class Program 2: { 3: private static int _nextNumber = 0; 4:  5: // the holder of the char to ordinal 6: private static ConcurrentDictionary<char, int> _dictionary 7: = new ConcurrentDictionary<char, int>(); 8:  9: // get the next id value 10: public static int NextId 11: { 12: get { return Interlocked.Increment(ref _nextNumber); } 13: } Then, we add a method that will perform our insert: 1: public static void Inserter() 2: { 3: for (int i = 0; i < 26; i++) 4: { 5: _dictionary.GetOrAdd((char)('A' + i), key => NextId); 6: } 7: } Finally, we run our test by starting two tasks to do this work and get the results… 1: public static void Main() 2: { 3: // 3 tasks attempting to get/insert 4: var tasks = new List<Task> 5: { 6: new Task(Inserter), 7: new Task(Inserter) 8: }; 9:  10: tasks.ForEach(t => t.Start()); 11: Task.WaitAll(tasks.ToArray()); 12:  13: foreach (var pair in _dictionary.OrderBy(p => p.Key)) 14: { 15: Console.WriteLine(pair.Key + ":" + pair.Value); 16: } 17: } If you run this with only one task, you get the expected A:1, B:2, ..., Z:26.  But running this in parallel you will get something a bit more complex.  My run netted these results: 1: A:1 2: B:3 3: C:4 4: D:5 5: E:6 6: F:7 7: G:8 8: H:9 9: I:10 10: J:11 11: K:12 12: L:13 13: M:14 14: N:15 15: O:16 16: P:17 17: Q:18 18: R:19 19: S:20 20: T:21 21: U:22 22: V:23 23: W:24 24: X:25 25: Y:26 26: Z:27 Notice that B is 3?  This is most likely because both threads attempted to call GetOrAdd() at roughly the same time and both saw that B did not exist, thus they both called the generator and one thread got back 2 and the other got back 3.  However, only one of those threads can get the lock at a time for the actual insert, and thus the one that generated the 3 won and the 3 was inserted and the 2 got discarded.  This is why on these methods your factory delegates should be careful not to have any logic that would be unsafe if the value they generate will be pitched in favor of another item generated at roughly the same time.  As such, it is probably a good idea to keep those generators as stateless as possible. Summary The ConcurrentDictionary is a very efficient and thread-safe version of the Dictionary generic collection.  It has all the benefits of type-safety that it’s generic collection counterpart does, and in addition is extremely efficient especially when there are more reads than writes concurrently. Tweet Technorati Tags: C#, .NET, Concurrent Collections, Collections, Little Wonders, Black Rabbit Coder,James Michael Hare

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  • My SMTP's outgoing mail gets bounced

    - by BloodPhilia
    I've got a ISPconfig 3 production server set up, running Ubuntu Server 9.04. My e-mail gets delivered ok to almost every other server I send mail to except for one (smtp.chello.nl which bounces my email). In my /var/log/mail.err I found the below error. Sep 23 08:59:33 <MYHOSTNAME> postfix/smtp[26944]: 3DB2B1456149: to=<<RECIPIENT>@chello.nl>, relay=smtp.chello.nl[213.46.255.2]:25, delay=2, delays=0.02/0.01/1.9/0.04, dsn=5.1.0, status=bounced (host smtp.chello.nl[213.46.255.2] said: 550 5.1.0 Dynamic/Generic hostnames are blocked. Please contact your Email Provider. Your IP was <MY IP>. Your hostname was ??. (in reply to MAIL FROM command)) What could be the cause of this? I did an SMTP check on mxtools.com and got the following: OK - Not an open relay OK - 0 seconds - Good on Connection time OK - 1.482 seconds - Good on Transaction time OK - 83.161.xx.xx resolves to a83-161-xx-xx.xxx.xxx.nl WARNING - Reverse DNS does not match SMTP Banner Update: My IP is static.

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  • map subdomain to another subdomain via cname

    - by Stephen
    Question: I need to get DNS configured to point a subdomain from one domain (which I will generally not be controlling) to another subdomain on a different domain name. Testing this process using a simple CNAME entry keeps pointing to the primary domain and not the subdomain where it should be going. This is the scenario; (newdomain.com is in my control) cdn.xyz.com should display content from this subdomain subdomain.newdomain.com It is instead displaying content from newdomain.com (not the subdomain sub domain) cdn.xyz.com/page.htm displays content from newdomain.com/page.htm although what I need is it to display content from subdomain.newdomain.com/page.htm Other Background: setup is between two different servers with different IP ranges although DNS cluster is on between all servers the newdomain.com is set up with its own unique IP (which is on the A records for the subdomains, the subdomains work as expected/normal) the DNS entry is correct (cdn CNAME subdomain.newdomain.com.) ie the end period is included a DNS lookup on the CNAME externally reports back as subdomain.newdomain.com. as the record Does anyone know what DNS entries I am missing to get this working correctly ? Note: I do not want to just put a redirect between domains as I need the content of subdomain.newdomain.com/content.html to be visible via the URL of cdn.xyz.com/content.html also I can just use some redirects on newdomain.com to achieve what I am after but would prefer to just get the DNS correct. EDIT Current DNS cdn CNAME subdomain.newdomain.com. || CNAME entry for domain1 subdomain A XXX.XXX.XXX.XXX || A record entry for working subdomain pointing to unique IP What should happen is that cdn.domain1.com - subdomain.newdomain.com What is happening is cdn.domain1.com - newdomain.com (ie. the root not the subdomain) EDIT 2 Actually if its easier I am trying to emulate a simple cloud setup like Rackspace Containers (which I assume is similar to Buckets on AWS). although it is not for cloud storage Where a container has a url reference of hd62321678d323.rackspace.com (in truth they are much longer) so I can use a CNAME record of: cdn CNAME hd62321678d323.rackspace.com. so that http://cdn.mydomain.com/myfile.jpg displays content from http://hd62321678d323.rackspace.com/myfile.jpg

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  • Windows Vista DHCP bug, arp authorize, isc dhcp, workaround

    - by jinanwow
    I am trying to find a workaround for the Windows Vista Force Broadcast bug with ISC DHCP and a Cisco Router. The problem is not windows vista trying to obtain an IP address from us that works fine (with or without the flag enabled). THe problem is we are using a cisco router and the command 'arp authorized' to prevent users from using static IP addresses on the network. The problem is, if Windows Vista sets the boot flag to true the command 'arp authorized' will not work, as it looks for the IP address and destination MAC address in the DHCP Offer Packet to add it to its arp table. The machine will DHCP just fine, but since the ARP table is not aware of the machine, it is unable to access the internet. If I disable the broadcast flag in vista, the next time it DHCPs an arp entry gets created since the DHCP Offer is unicast instead of broadcast. The thing is, we can not tell 500 to 1000 people to edit their registry, so we need a workaround for this issue. I have not had much success in finding a workaround. The question is, is there a way to force or trick ISC DHCP into unicasting a responce back to the user. Either on the Cisco Side, ISC DHCP side or intercepting and rewriting the DHCP Discover UDP packet to turn off the flag before it reaches ISC DHCP?

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  • Managing scalability and availability with two servers running Apache Httpd, Apache Mina and MySQL

    - by celalo
    Hello, I am not a developer and I don't much experience with scalable server architectures. But I am in need of a highly available and scalable system for one of my projects. There is going to be two servers I am going to use for the time being. Both with 4 core CPUs and 8 GB RAM with RAID structures running CentOS 5.4. I will also have feature called "Failover IP" which enables to direct an IP address to another server within short time. The applications which will be run on the servers: There is going to be a Java application based on Apache Mina server for handling TCP requests from some hundreds of network devices where the devices are going to send request as much as one request per minute. Handling those requests, includes parsing the requests and inserting a few rows to the Database. Parsing requests before inserting data to the DB does take neglectable time. There is going to be MySQL server, as I stated above. Also there is going to be a PHP web application running on Apache Httpd Server which uses the same DB with the Java application. What I wish to have is to make use of those two servers at the most. I was imagining to have the servers identical, sharing the work load. MySQL could be a cluster maybe? And if some application fails or the whole machine goes down, the other will continue serving the requests seamlessly. Reminding that a "Failover IP" feature will be available for me to take advantage of. Also, It should be kept in mind that number of servers could increase in time, to meet the demand. What can you suggest? Which kind of tools I can make use of? Which kind of monitoring software (paid/unpaid) I have? Thanks in advance.

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  • Cisco: Site-to-site VPN with cisco 878 and ASA weirdness

    - by cpf
    I currently have 2 sites, both connected to each other through 2 firewalls / routers in a site-to-site VPN. Pinging from server to server (Using 2mb/2mb SDSL) through that VPN obviously works, however, at one site, we have another internet connection (7m/400k ADSL), and only the link between the two sites should be on the other connection. All pc's should go over the other connection for internet, just communication between servers & Communication between pc's and the server at the other side should go through there too. What is configured at the moment is the server is using the SDSL directly as default gateway. Since it's not intended to surf anything it is a safe config. PC's are configured on the ADSL as default gateway. Now I wanted to route through everything that uses the range used on the other site, it should be sent from the ADSL modem to the SDSL modem, which has the VPN connection. I figured I could use OSPF to do so, however, OSPF doesn't seem to "detect" the range of the external site. Also (due to bad ip subnetting thanks to the other administrator), the ip used internally as the server on the other site also exists on the internet (causing a lot of confusion), so rdp-ing from our server to the server of the other site works (somehow), but tracerouting on the SDSL router (which should actually, in my opinion, go over the VPN) actually goes all over the internet. My question(s): Why doesn't the SDSL router ping the external ip through VPN, but the server does? Why can't I route from the ADSL router to the SDSL over VPN? I would seriously appreciate some help, since I can't figure out why it does it like this.

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  • Creating a DNS Server

    - by c.adhityaa
    OK, I am a complete newbie to all this, so please bear with me. I want to create a DNS Server (like Google does - 8.8.8.8). I understand that a DNS Server is a Server that gives a IP on being given a hostname, ie. when I ask it what is the IP of google.com, it says "64.233.160.0". So, what I want to do is create a similar one that holds records of what translates to what. I thought of this since it looks to be similar to a webserver - ask for a page and it gives back the page. That is, when my machine has the IP xxx.xxx.xxx.xxx and people chose xxx.xxx.xxx.xxx as their Primary DNS Server, then when they ask "www.google.com", I sould be able to tell "64.233.160.0". So, how do I create this DNS Server that is accessible to everyone in the world ? It would be easier if we have something like EasyPHP which is the analogue to a webserver here. I am sorry if I have caused any trauma because this might seem rubbish to experts ;) Adhityaa

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  • HA Proxy Stick-table and tcp-connection configuration

    - by Vladimir
    I am using HA Proxy HA-Proxy version 1.4.18 2011/09/16 I am trying to insert the following into /etc/init.d/haproxy.cfg file # Use General Purpose Couter (gpc) 0 in SC1 as a global abuse counter # Monitors the number of request sent by an IP over a period of 10 seconds stick-table type ip size 1m expire 10s store gpc0,http_req_rate(10s) tcp-request connection track-sc1 src tcp-request connection reject if { src_get_gpc0 gt 0 } # Table definition stick-table type ip size 100k expire 30s store conn_cur(3s) # Allow clean known IPs to bypass the filter tcp-request connection accept if { src -f /etc/haproxy/whitelist.lst } # Shut the new connection as long as the client has already 10 opened tcp-request connection reject if { src_conn_cur ge 10 } tcp-request connection track-sc1 src I get the following error: [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:36] : stick-table: unknown argument 'store'. [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:37] : unknown argument 'connection' after 'tcp-request' in proxy 'http_proxy' [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:38] : unknown argument 'connection' after 'tcp-request' in proxy 'http_proxy' [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:41] : stick-table: unknown argument 'store'. [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:43] : unknown argument 'connection' after 'tcp-request' in proxy 'http_proxy' [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:45] : unknown argument 'connection' after 'tcp-request' in proxy 'http_proxy' [ALERT] 256/113143 (4627) : parsing [/etc/haproxy/haproxy.cfg:46] : unknown argument 'connection' after 'tcp-request' in proxy 'http_proxy' [ALERT] 256/113143 (4627) : Error(s) found in configuration file : /etc/haproxy/haproxy.cfg [WARNING] 256/113143 (4627) : Proxy 'http_proxy': in multi-process mode, stats will be limited to process assigned to the current request. [ALERT] 256/113143 (4627) : Fatal errors found in configuration. [fail] Could you please tell me what is wrong with the code? Thanks!

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  • Getting SMB file shares working over a PPTP VPN

    - by Ben Scott
    I'm having issues getting SMB file shares working over a PPTP VPN. The server setup consists of a security device (DrayTek V3300) which passes the PPTP authentication to a SBS2003 server running RRAS. The server is the DC and provides DNS and WINS, the single NIC's name server is set to the NIC's IP (192.168...), and DHCP on the DrayTek sets the server IP as the DNS. If I create a new VPN connection in Win7, leaving everything as default apart from the server, username, password and domain, I can: ping everything by IP address resolve IPs with nslookup using their fully-qualified name, as in nslookup fileserver.mydomain.local ping machines by fully-qualified name, as in ping fileserver.mydomain.local However if I try to access a file share: within Explorer, I get "Windows cannot access ..." with "Error code: 0x80004005 Unspecified Error", using net use z: \\fileserver.mydomain.local\share, I get "System error 53 has occurred. The network path was not found." If I add the machine name to my HOSTS file I can use the file share, which is my last-ditch workaround, but I have a number of VPN users and would rather a solution that doesn't involve me trying to hand-edit system files on computers half a country away. If I set the WINS server explicitly in the connection's IPv4 settings I don't have to use the FQN to ping the machine, but that doesn't change anything else. EDIT: The PC I'm having the issue on is running Win 7 Home Premium. After more testing I actually have two other PCs that work, one W7HP, one XP Home, and another Vista PC that doesn't work (not tested as much as the others), all four on the same internet connection (behind the same router). All of them were tested with a straight-forward, all defaults, new VPN configuration.

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  • Issues with doing a P2V on Exchange 2007

    - by PokermUNKEE
    I shutdown all Exchange services on the physical box and did a convert. Everything converted fine. Server booted up no issues and I could receive email from the outside world with no issues. But I am unable to send emails internally or externally. They just sit in the Outbox. I also disabled the DHCPClient service as I didn't want the server to get an IP address from DHCP when it first came online. It came online with no IP, then I used console to assign the correct static IP address (same one on the physical server) and rebooted. I ran the Exchange Troubleshooting Agent and it gave me the following errors: The value for the '\MSExchangeIS Mailbox\Messages Queued For Submission' counter on server exchange is greater than zero (average value is 8.8) and it appears that 'MSExchangeMailSubmission' is failing to submit messages to at least one computer with the Hub Transport server role installed over the last minute. Found 1 computers with the Hub Transport server role installed in the same Active Directory site as server exchange using local Active Directory site GUID 'ce8a4367-1bf6-4825-9cac-c4e2b115c450'. Check Local Active Directory Site Hub Transport Server Role Health (Mailflow_CheckLocalBhHealth1.1.1.1.1.1.1.1) I have one Exchange server with all the roles on it. Has anyone see this before when doing a convert? Please help :(

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  • DNS slow after losing DNS Server

    - by Tim
    We have set up a small Windows Server 2008 R2 network with a domain controller which is also acting as the DNS server for the network (we opted to install DNS when setting up the domain). This network isn't connected to the Internet in any way, so all machines have been configured to use the IP address of the domain controller as their primary DNS and no secondary DNS server has been configured. If we shut down or unplug the network cable from the domain controller, DNS lookups become quite slow and the performance of the network suffers. For example, running a ping command using a hostname takes around 5-6 seconds to resolve the name. I presume this is because it is looking for the DNS, then falling back to some other method of resolving the names as the DNS server is now gone. All the machines have static IP addresses so we are considering just putting all entries in the HOSTS file of each machine. However, it would be nice to have a centralised DNS in case we one day change the IP of one of the machines. Is there a better way to speed this up?

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  • iptables -P FORWARD DROP makes port forwarding slow

    - by Isaac
    I have three computers, linked like this: box1 (ubuntu) box2 router & gateway (debian) box3 (opensuse) [10.0.1.1] ---- [10.0.1.18,10.0.2.18,10.0.3.18] ---- [10.0.3.15] | box4, www [10.0.2.1] Among other things I want box2 to do nat and port forwarding, so that I can do ssh -p 2223 box2 to reach box3. For this I have the following iptables script: #!/bin/bash # flush iptables -F INPUT iptables -F FORWARD iptables -F OUTPUT iptables -t nat -F PREROUTING iptables -t nat -F POSTROUTING iptables -t nat -F OUTPUT # default default_action=DROP for chain in INPUT OUTPUT;do iptables -P $chain $default_action done iptables -P FORWARD DROP # allow ssh to local computer allowed_ssh_clients="10.0.1.1 10.0.3.15" for ip in $allowed_ssh_clients;do iptables -A OUTPUT -p tcp --sport 22 -d $ip -j ACCEPT iptables -A INPUT -p tcp --dport 22 -s $ip -j ACCEPT done # allow DNS iptables -A OUTPUT -p udp --dport 53 -m state \ --state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -A INPUT -p udp --sport 53 -m state \ --state ESTABLISHED,RELATED -j ACCEPT # allow HTTP & HTTPS iptables -A OUTPUT -p tcp -m multiport --dports 80,443 -j ACCEPT iptables -A INPUT -p tcp -m multiport --sports 80,443 -j ACCEPT # # ROUTING # # allow routing echo 1 >/proc/sys/net/ipv4/ip_forward # nat iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE # http iptables -A FORWARD -p tcp --dport 80 -j ACCEPT iptables -A FORWARD -p tcp --sport 80 -j ACCEPT # ssh redirect iptables -t nat -A PREROUTING -p tcp -i eth1 --dport 2223 -j DNAT \ --to-destination 10.0.3.15:22 iptables -A FORWARD -p tcp --sport 22 -j ACCEPT iptables -A FORWARD -p tcp --dport 22 -j ACCEPT iptables -A FORWARD -p tcp --sport 1024:65535 -j ACCEPT iptables -A FORWARD -p tcp --dport 1024:65535 -j ACCEPT iptables -I FORWARD -j LOG --log-prefix "iptables denied: " While this works, it takes about 10 seconds to get a password promt from my ssh command. Afterwards, the connection is as responsive as could be. If I change the default policy for my FORWARD chain to "ACCEPT", then the password promt is there imediatly. I have tried analysing the logs, but I can not spot a difference in the logs for ACCEPT/DROP in my FORWARD chain. Also I have tried allowing all the unprivileged ports, as box1 uses thoses for doing ssh to box2. Any hints? (If the whole setup seems strange to you - the point of the exercise is to understand iptables ;))

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  • playsms sent sms to queue

    - by user512213
    i install playsms in my system as below mentioned way https://github.com/antonraharja/playSMS/wiki/Web-User-Interface-Installation i use kannel as a gateway and kannel running fine i get the following status while i check kannel status in browser. Kannel bearerbox version `1.4.3'. Build `Nov 24 2011 08:02:18', compiler `4.6.2'. System Linux, release 3.2.0-23-generic-pae, version #36-Ubuntu SMP Tue Apr 10 22:19:09 UTC 2012, machine i686. Hostname MSSRF-INCOIS, IP 127.0.1.1. Libxml version 2.7.8. Using OpenSSL 1.0.0e 6 Sep 2011. Compiled with MySQL 5.5.17, using MySQL 5.5.24. Using SQLite 3.7.9. Using native malloc. Status: running, uptime 0d 1h 8m 27s WDP: received 0 (0 queued), sent 0 (0 queued) SMS: received 0 (0 queued), sent 0 (0 queued), store size -1 SMS: inbound (0.00,0.00,0.00) msg/sec, outbound (0.00,0.00,0.00) msg/sec DLR: 0 queued, using internal storage Box connections: wapbox, IP 127.0.0.1 (on-line 0d 1h 8m 2s) wapbox, IP 127.0.0.1 (on-line 0d 0h 18m 11s) SMSC connections: unknown AT2[/dev/ttyS0] (online 4106s, rcvd 0, sent 0, failed 0, queued 0 msgs) But when i try to send sms in playsms means it shows "Your SMS has been delivered to queue " but sms not received .Any thing we missed out while configuration.any one advice me to proceed.

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  • Squid configuration for proxy server

    - by Ian Rob
    I have a server with 10 ip's that I want to give access to some friends via authentication but I'm stuck on squid's config file. Let's say I have these ip's available on my server: 212.77.23.10 212.77.1.10 68.44.82.112 And I want to allocate each one of them to a different user like so: 212.77.23.10 goes to user manilodisan using password 123456 212.77.1.10 goes to user manilodisan1 using password 123456 68.44.82.112 goes to user manilodisan2 using password 123456 I managed to add the passwords and authentication works ok but how do I do to restrict one user to one of the available ip's? I have a basic setup from different bits I found over the internet but nothing seems to work. Here's my squid.conf (all comments are removed to make it lighter): acl ip1 myip 212.77.23.10 acl ip2 myip 212.77.1.10 tcp_outgoing_address 212.77.23.10 ip1 tcp_outgoing_address 212.77.1.10 ip2 http_port 8888 visible_hostname weezie auth_param basic program /usr/lib/squid/ncsa_auth /etc/squid/squid-passwd acl ncsa_users proxy_auth REQUIRED http_access allow ncsa_users acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 # https acl SSL_ports port 563 # snews acl SSL_ports port 873 # rsync acl Safe_ports port 80 # http acl Safe_ports port 21 # ftp acl Safe_ports port 443 # https acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port 591 # filemaker acl Safe_ports port 777 # multiling http acl Safe_ports port 631 # cups acl Safe_ports port 873 # rsync acl Safe_ports port 901 # SWAT acl purge method PURGE acl CONNECT method CONNECT http_access allow manager localhost http_access deny manager http_access allow purge localhost http_access deny purge http_access deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow localhost http_access deny all icp_access allow all hierarchy_stoplist cgi-bin ? access_log /var/log/squid/access.log squid acl QUERY urlpath_regex cgi-bin \? cache deny QUERY refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 refresh_pattern . 0 20% 4320 acl apache rep_header Server ^Apache broken_vary_encoding allow apache extension_methods REPORT MERGE MKACTIVITY CHECKOUT hosts_file /etc/hosts forwarded_for off coredump_dir /var/spool/squid

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  • Ipsec config problem // openswan

    - by user90696
    I try to configure Ipsec on server with openswan as client. But receive error - possible, it's auth error. What I wrote wrong in config ? Thank you for answers. #1: STATE_MAIN_I2: sent MI2, expecting MR2 003 "f-net" #1: received Vendor ID payload [Cisco-Unity] 003 "f-net" #1: received Vendor ID payload [Dead Peer Detection] 003 "f-net" #1: ignoring unknown Vendor ID payload [ca917959574c7d5aed4222a9df367018] 003 "f-net" #1: received Vendor ID payload [XAUTH] 108 "f-net" #1: STATE_MAIN_I3: sent MI3, expecting MR3 003 "f-net" #1: discarding duplicate packet; already STATE_MAIN_I3 010 "f-net" #1: STATE_MAIN_I3: retransmission; will wait 20s for response 003 "f-net" #1: discarding duplicate packet; already STATE_MAIN_I3 003 "f-net" #1: discarding duplicate packet; already STATE_MAIN_I3 003 "f-net" #1: discarding duplicate packet; already STATE_MAIN_I3 010 "f-net" #1: STATE_MAIN_I3: retransmission; will wait 40s for response 031 "f-net" #1: max number of retransmissions (2) reached STATE_MAIN_I3. Possible authentication failure: no acceptable response to our first encrypted message 000 "f-net" #1: starting keying attempt 2 of at most 3, but releasing whack other side - Cisco ASA. parameters for my connection on our Linux server : VPN Gateway 8.*.*.* (Cisco ) Phase 1 Exchange Type Main Mode Identification Type IP Address Local ID 4.*.*.* (our Linux server IP) Remote ID 8.*.*.* (VPN server IP) Authentication PSK Pre Shared Key Diffie-Hellman Key Group DH 5 (1536 bit) or DH 2 (1024 bit) Encryption Algorithm AES 256 HMAC Function SHA-1 Lifetime 86.400 seconds / no volume limit Phase 2 Security Protocol ESP Connection Mode Tunnel Encryption Algorithm AES 256 HMAC Function SHA-1 Lifetime 3600 seconds / 4.608.000 kilobytes DPD / IKE Keepalive 15 seconds PFS off Remote Network 192.168.100.0/24 Local Network 1 10.0.0.0/16 ............... Local Network 5 current openswan config : # config setup klipsdebug=all plutodebug="control parsing" protostack=netkey nat_traversal=no virtual_private=%v4:10.0.0.0/8,%v4:192.168.0.0/16,%v4:172.16.0.0/12 oe=off nhelpers=0 conn f-net type=tunnel keyexchange=ike authby=secret auth=esp esp=aes256-sha1 keyingtries=3 pfs=no aggrmode=no keylife=3600s ike=aes256-sha1-modp1024 # left=4.*.*.* leftsubnet=10.0.0.0/16 leftid=4.*.*.* leftnexthop=%defaultroute right=8.*.*.* rightsubnet=192.168.100.0/24 rightid=8.*.*.* rightnexthop=%defaultroute auto=add

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  • ICMP Redirect Theory VS. Application

    - by joeqwerty
    I'm trying to watch ICMP redirects in a lab using Cisco Packet Tracer (version 5.3.2) and I'm not seeing them, which leads me to believe that either my lab configuration isn't correct or my understanding of ICMP redirects isn't correct or that Packet Tracer doesn't support/use ICMP redirects. Here's what I believe to be true regarding ICMP redirects: Routers send ICMP redirects when all of these conditions are met: The interface on which the packet comes into the router is the same interface on which the packet gets routed out. The subnet or network of the source IP address is on the same subnet or network of the next-hop IP address of the routed packet. The datagram is not source-routed. The router kernel is configured to send redirects. I have the lab set up in Cisco Packet Tracer as displayed in the image and would expect to see an ICMP redirect from Router1 when pinging from PC1 to PC3. I'm not seeing the ICMP redirect and it looks like Router1 is actually routing all of the packets via Router2. I have IP ICMP debugging enabled on Router1 (and Router2) and I'm not seeing any ICMP redirect activity in either console. I'm also not seeing a route to the PC3 network in the routing table on PC1, which I think confirms that the ICMP redirect is not occurring. I'm using only static routing on Routers 1 and 2. Is my understanding of ICMP redirects incorrect, or is there a problem with my lab configuration or does Packet Tracer not support/use ICMP redirects?

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  • VLAN support on Juniper EX - 2200 switches

    - by liv2hak
    I have 6 Juniper switches (EX - 2200) connected to each other as shown in the network topology below. I have two PC's that I am using PC1 - (used for configuring the 6 switches via minicom) PC2 - to monitor the traffic between the switches via the Ports that are marked with arrows in the diagram. STEP 1: I create a new vlan On Switch 3 (SW3) that includes Port 12 and Port 22. I also assign l3-interface to the vlan (vlan_2) with ip address - 192.168.1.7. Now I plug-in Port 0 of Switch 3 on PC2. Now I try pinging 192.168.1.7 from PC2 (192.168.1.10) I want to know what will happen? My postulation is that I will not be able to ping SW3 from PC2.This is because SW3 (Port 12 and Port 22) is a part of a vlan_2 and vlan_2 logically breaks up broadcast domains and so 192.168.1.7 will not be reachable from 192.168.1.10. Now I have an l3-interface on SW1 with IP 192.168.1.1 using default vlan( vlan-id 0). Similarly I have enabled IP on SW2 - 192.168.1.2 SW3 - 192.168.1.3 SW4 - 192.168.1.4 SW5 - 192.168.1.5 SW6 - 192.168.1.6 all using default vlan. Now I plug in Port 12 of SW3 (blue cable) into the PC2. I try to ping 192.168.1.1 from PC2. What will happen at this stage.? My postulation is that I will be able to ping switch 1.Is this correct? Also another question is that can a single port on a Switch be added multiple VLANS? I am a beginner at network configuration? Any help would be highly appreciated. (Please ignore the CISCO symbol on the switches in the diagram.All swithes are Junper EX 22-00.)

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  • setting up synergy (multi-computer shared input devices) new to mac

    - by pedalpete
    I've just gotten a mac and the first thing I'm trying to do in setting it up for dev is to set-up synergy. I've run into countless issues, and am making progress, but that 'mac's just work' theory is getting tired really fast. I'd prefer running the mac as the server, as it's a desktop. why use my pc(laptop) as the server. So i downloaded synergy, and tried to edit the 'synergy.conf' file. First with textmate, then with apple script. Neither of these applications will open the file. Even after changing textmate to use plain text format and switching off a few other things to make it into a plain text editor. No good. Uh, isn't that what these script/text editors are for? Then I found SyneryKM which is a package to run synergy on osx. Took LOTS of fiddling, but I think I finally kinda got it figured out. I've got my pc & mac both running synergy. However, my pc will only connect to synergy using the ip address. No problem, however, my mac won't connect to itself as a synergy server using the IP address. If I use the ip address as a screen in the 'server configuration file', i get a 'Error: unknown screen name mymac'. I know this shouldn't be super complicated, and possibly not the place to find answers about synergy, but I couldn't find a better place, and there has been some talk of synergy here. Any chance somebody can help with this?

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  • Cisco ASA intermittently fails to see traffic

    - by DrStalker
    users | Mikrotik -- Internet | ASA | ServerA and ServerB I'm trying to troubleshoot a problem with a new Cisco ASA 5505. The network design is as above - the Microtik is the existing router, ServerA and ServerB used to plug directly into it. ServerA has IP 10.30.1.10, ServerB has IP 10.30.1.11 The ASA is configured with no NAT, a "allow anything" firewall, and uses the microtik as its default gateway. In effect, it is currently a simple IP router; the firewall and VPN stuff will all come later once the basics are working. Th problem is access to ServerA and ServerB is erratic - sometimes it will work, sometimes it will fail. It can fail for either one of the servers only, or both. When it is working: The Mikrotik logs show ping packets being sent out over the proper interface The ASA logs show the incoming connections. When it is failing: The Mikrotik logs show ping packets being sent out over the proper interface The ASA logs show nothing reaching the ASA. This can fail for one server only (e.g.: the Mikrotik is putting out packets to 10.30.1.10 and 10.30.1.11, but the ASA is only seeing packets arrive destined for 10.30.1.11) It can fail for one source only (e.g.: ClientA on the users network can ping 10.30.1.11, but clientB cannot) The problem can also be seen from the mikrotik router itself; sometimes it can ping ServerA and ServerB, sometimes it can only ping one of them What could be causing this? I can't think of any possible cause that is intermittent and could explain why the problem may occur for one destination server and not others. edit: Link to ASA config

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  • Trouble with IIS SMTP relaying to Gmail

    - by saille
    I appreciate that similar questions have been asked about how to setup SMTP relaying with IIS's virtual SMTP server. However I'm still completely stumped on this problem. Here's the setup: IIS 6.0 SMTP server running on Win2k3 box with a NAT'ed IP. Company uses Gmail for all email services. An app on the box needs to send email, so normally we'd just set the app up to talk to smtp.gmail.com directly, but this app doesn't support TLS. Easy, we just setup a local SMTP relay right? So I thought. What we have done so far: Setup IIS SMTP server to relay to smtp.gmail.com, as per these excellent instructions: http://fmuntean.wordpress.com/2008/10/26/how-to-configure-iis-smtp-server-to-forward-emails-using-a-gmail-account/ The local SMTP relay allows anonymous access. Both the local IP and the loopback IP have been explicitly allowed in the Connection... and Relay... dialogs. Tried sending email from 2 different apps via the local SMTP server, but failed (the emails end up in the Queue folder, but never get sent). The IIS logs show the conversation with the local app, but zero conversation happening with smtp.gmail.com. The port used by gmail is open outbound, and indeed the apps we have that support TLS can send email directly via smtp.gmail.com, so there is no problem with the network. At this point I changed the smtp settings in IIS SMTP server to use a different external SMTP server and hey-presto, the local apps can send email via local IIS SMTP relay. So smtp.gmail.com fails to work with our IIS SMTP relay, but another 3rd party SMTP service works fine. We need to use smtp.gmail.com, so how to troubleshoot this one?

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  • apache vhost not working consistently

    - by petrus
    I have a vhost on my webserver whose sole and unique goal is to return the client IP adress: petrus@bzn:~$ cat /home/vhosts/domain.org/index.php <?php echo $_SERVER['REMOTE_ADDR']; echo "\n" ?> This helps me troubleshoot networking issues, especially when NAT is involved. As such, I don't always have domain name resolution and this service needs to work even if queried by its IP address. I'm using it this way: petrus@hive:~$ echo "GET /" | nc 88.191.124.41 80 191.51.4.55 petrus@hive:~$ echo "GET /" | nc domain.org 80 191.51.4.55 router#more http://88.191.124.41/index.php 88.191.124.254 However I found that it wasn't working from at least a computer: petrus@seth:~$ echo "GET /" | nc domain.org 80 petrus@seth:~$ petrus@seth:~$ echo "GET /" | nc 88.191.124.41 80 petrus@seth:~$ What I checked: This is not related to ipv6: petrus@seth:~$ echo "GET /" | nc -4 ydct.org 80 petrus@seth:~$ petrus@hive:~$ echo "GET /" | nc ydct.org 80 2a01:e35:ee8c:180:21c:77ff:fe30:9e36 netcat version is the same (except platform, i386 vs x64): petrus@seth:~$ type nc nc est haché (/bin/nc) petrus@seth:~$ file /bin/nc /bin/nc: symbolic link to `/etc/alternatives/nc' petrus@seth:~$ ls -l /etc/alternatives/nc lrwxrwxrwx 1 root root 15 2010-06-26 14:01 /etc/alternatives/nc -> /bin/nc.openbsd petrus@hive:~$ type nc nc est haché (/bin/nc) petrus@hive:~$ file /bin/nc /bin/nc: symbolic link to `/etc/alternatives/nc' petrus@hive:~$ ls -l /etc/alternatives/nc lrwxrwxrwx 1 root root 15 2011-05-26 01:23 /etc/alternatives/nc -> /bin/nc.openbsd It works when used without the pipe: petrus@seth:~$ nc domain.org 80 GET / 2a01:e35:ee8c:180:221:85ff:fe96:e485 And the piping works at least with a test service (netcat listening on 1234/tcp and output to stdout) petrus@bzn:~$ nc -l -p 1234 GET / petrus@bzn:~$ petrus@seth:~$ echo "GET /" | nc domain.org 1234 petrus@seth:~$ I don't know if this issue is more related to netcat or Apache, but I'd appreciate any pointers to troubleshoot this issue ! The IP addresses have been modified but kept consistent for easy reading. bzn is the server, hive is a working client and seth is the client on which I have the issue.

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