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  • bad switchs duplicate my ip

    - by tacoen
    I had a large area LAN. There were many switch and AP on it, then somehow I couldn't ping my servers, and it's said that the IP was duplicated. I use arpwatch and found out that one of the switch flip-flop-ing the IP. I isolated that troublesome switch using his mac-address. But, since this a large area LAN... I doubt this will be the last cases. If there any software or hardware that I can use to prevent this kind of error? Sorry for my bad English.

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  • Does the .NET Framework need to be reoptimized after upgrading to a new CPU microarchitecture?

    - by Louis
    I believe that the .NET Framework will optimize certain binaries targeting features specific to the machine it's installed on. After changing the CPU from an Intel Nehalem to a Haswell chip, should the optimization be run again manually? If so, what is the process for that? Between generations here are some notable additions: Westmere: AES instruction set Sandy Bridge: Advanced Vector Extensions Ivy Bridge: RdRand (hardware random number generator), F16C (16-bit Floating-point conversion instructions) Haswell: Haswell New Instructions (includes Advanced Vector Extensions 2 (AVX2), gather, BMI1, BMI2, ABM and FMA3 support) So my, albeit naive, thought process was that the optimizations could take advantage of these in general cases. For example, perhaps calls to the Random library could utilize the hardware-RNG on Ivy Bridge and later models.

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  • How to get online or offline state of a WCF Service with a WP7 Application

    - by Arjuna Wenzel
    im working on a Windows Phone 7 Application that communicates with a Azure hosted WCF service. Everything works fine in communication and so on. But i want to handle the situation when the Service is not online. Now the WP7 App has a main screen with a login. After clicking the "Login" button the Application sends the credentials to the WCF Service which communicates with a Database. And now my question is, is there a way to get the online/offline state of the WCF Service? So i could give feedback to the user and the application wouldnt crash (: Thx alot for any answer!

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  • ionice idle is ignored

    - by Ferran Basora
    I have been testing the ionice command for a while and the idle (3) mode seems to be ignored in most cases. My test is to run both command at the same time: du <big folder> ionice -c 3 du <another big folder> If I check both process in iotop I see no difference in the percentage of io utilization for each process. To provide more information about the CFQ scheduler I'm using a 3.5.0 linux kernel. I started doing this test because I'm experimenting a system lag each time a daily cron job updatedb.mlocate is executed in my Ubuntu 12.10 machine. If you check the /etc/cron.daily/mlocate file you realize that the command is executed like: /usr/bin/ionice -c3 /usr/bin/updatedb.mlocate Also, the funny thing is that whenever my system for some reason starts using swap memory, the updatedb.mlocate io process is been scheduled faster than kswapd0 process, and then my system gets stuck. Some suggestion? References: http://ubuntuforums.org/showthread.php?t=1243951&page=2 https://bugs.launchpad.net/ubuntu/+source/findutils/+bug/332790

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  • How do I use rsync to sync my repo on my mac to university server where I have ssh access?

    - by snihalani
    I need to use my university's ssh access and run my programs there for testing. I don't have sudo access there. It doesn't have vncserver there either. I would work with vim and make but I need git at least. Now I am looking into rsync to sync my current source directory into a remote directory and I'll ssh into the directory and run my make file to test it. I am looking at the man page of rsync and it looks very complicated. Can anyone please help me with this? I have googled in superuser and all commands seem different for different cases. Can anyone please help me with this?

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  • Stored Procedure or calculations via IQueryable?

    - by Shawn Mclean
    This is a question that is based on choosing performance over design practices. If I have a method that will be executed many times a second; public static IQueryable<IPerson> InRadius(this IQueryable<IPerson> query, Coordinate center, double radius) { return (from u in query where CallHeavyMathFormula(u, center, radius) select u); } This extension method for IQueryable generates a SQL that does some heavy maths calculation (Cosine, Sine, etc). This would mean the application sends 1-2KB of sql to the server per call. I've heard of placing all application logic, in your application. I also would like to change to a database such as azure or one of those scalable databases in the future. How do I handle something like this? Should I leave it as it is now or write stored procedures? How do applications like twitter or facebook do it?

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  • Trouble with mod_rewrite and PHP Extensions - Help Making the Correct .htaccess File

    - by nicorellius
    I'm looking for a set of simple rules and redirects for my site. I've tried so many combinations that I'm starting to get confused. I'm not sure how to set this up. Generally, without mod-rewrite, I would use relative paths to link to files: <a href="link.php">Link</a> if it's in the same directory. Now I'd like to use this: <a href="link">Link</a> And so if you go to this page: localhost/mysite/link it will take you to the correct place, which would be: localhost/mysite/link.php But also, many directory levels deep I would like it to work as well: localhost/mysite/group/link2 would go to: localhost/mysite/group/link2.php and: localhost/mysite/group/section/link3 would go to: localhost/mysite/group/section/link3.php But then in all these cases, if someone were to type in this: localhost/mysite/group/section/link3.php in the URL bar, it would show this: localhost/mysite/group/section/link3 Thanks

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  • mysql_fetch_array() problem

    - by Marty
    So I have 3 DB tables that are all identical in every way (data is different) except the name of the table. I did this so I could use one piece of code with a switch like so: function disp_bestof($atts) { extract(shortcode_atts(array( 'topic' => '' ), $atts)); $connect = mysql_connect("localhost","foo","bar"); if (!$connect) { die('Could not connect: ' . mysql_error()); } switch ($topic) { case "attorneys": $bestof_query = "SELECT * FROM attorneys p JOIN (awards a, categories c, awardLevels l) ON (a.id = p.id AND c.id = a.category AND l.id = a.level) ORDER BY a.category, a.level ASC"; $category_query = "SELECT * FROM categories"; $db = mysql_select_db('roanoke_BestOf_TopAttorneys'); $query = mysql_query($bestof_query); $categoryQuery = mysql_query($category_query); break; case "physicians": $bestof_query = "SELECT * FROM physicians p JOIN (awards a, categories c, awardLevels l) ON (a.id = p.id AND c.id = a.category AND l.id = a.level) ORDER BY a.category, a.level ASC"; $category_query = "SELECT * FROM categories"; $db = mysql_select_db('roanoke_BestOf_TopDocs'); $query = mysql_query($bestof_query); $categoryQuery = mysql_query($category_query); break; case "dining": $bestof_query = "SELECT * FROM restaurants p JOIN (awards a, categories c, awardLevels l) ON (a.id = p.id AND c.id = a.category AND l.id = a.level) ORDER BY a.category, a.level ASC"; $category_query = "SELECT * FROM categories"; $db = mysql_select_db('roanoke_BestOf_DiningAwards'); $query = mysql_query($bestof_query); $categoryQuery = mysql_query($category_query); break; default: $bestof_query = "switch on $best did not match required case(s)"; break; } $category = ''; while( $result = mysql_fetch_array($query) ) { if( $result['category'] != $category ) { $category = $result['category']; //echo "<div class\"category\">"; $bestof_content .= "<h2>".$category."</h2>\n"; //echo "<ul>"; Now, this whole thing works PERFECT for the first two cases, but the third one "dining" breaks with this error: Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result resource ... on line 78 Line 78 is the while() at the bottom. I have checked and double checked and can't figure what the problem is. Here's the DB structure for 'restaurants': CREATE TABLE `restaurants` ( `id` int(10) NOT NULL auto_increment, `restaurant` varchar(255) default NULL, `address1` varchar(255) default NULL, `address2` varchar(255) default NULL, `city` varchar(255) default NULL, `state` varchar(255) default NULL, `zip` double default NULL, `phone` double default NULL, `URI` varchar(255) default NULL, `neighborhood` varchar(255) default NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM AUTO_INCREMENT=249 DEFAULT CHARSET=utf8 Does anyone see what I'm doing wrong here? I'm passing "dining" to the function and as I said before, the first two cases in the switch work fine. I'm sure it's something stupid...

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  • Cloud Apps and Single Sign-On (AD integration)

    - by Pablo Alvim
    I've been investigating some cloud vendors and the ability to implement single sign-on with them, especially when it comes to AD (Active Directory) integration. So far I've learned that with Azure this is possible through ADFS and the AppFabric Access Control offer. In AWS, since it is possible to create a VPN and see EC2 instances as a natural extension of a private datacenter, I believe implementing SSO would be rather simple (not sure if I'm right on this one... Please correct me if I'm wrong). With App Engine though, even though there is some documentation on AD synchronization (not full integration) for Google Apps, I'm struggling to find out whether AD integration would be possible... Is there any strategy for that? Any bit of information on cloud apps and AD integration will be appreciated!

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  • How do I recursively define a Hash in Ruby from supplied arguments?

    - by Sarah Beckham
    This snippet of code populates an @options hash. values is an Array which contains zero or more heterogeneous items. If you invoke populate with arguments that are Hash entries, it uses the value you specify for each entry to assume a default value. def populate(*args) args.each do |a| values = nil if (a.kind_of? Hash) # Converts {:k => "v"} to `a = :k, values = "v"` a, values = a.to_a.first end @options[:"#{a}"] ||= values ||= {} end end What I'd like to do is change populate such that it recursively populates @options. There is a special case: if the values it's about to populate a key with are an Array consisting entirely of (1) Symbols or (2) Hashes whose keys are Symbols (or some combination of the two), then they should be treated as subkeys rather than the values associated with that key, and the same logic used to evaluate the original populate arguments should be recursively re-applied. That was a little hard to put into words, so I've written some test cases. Here are some test cases and the expected value of @options afterwards: populate :a => @options is {:a => {}} populate :a => 42 => @options is {:a => 42} populate :a, :b, :c => @options is {:a => {}, :b => {}, :c => {}} populate :a, :b => "apples", :c => @options is {:a => {}, :b => "apples", :c => {}} populate :a => :b => @options is {:a => :b} # Because [:b] is an Array consisting entirely of Symbols or # Hashes whose keys are Symbols, we assume that :b is a subkey # of @options[:a], rather than the value for @options[:a]. populate :a => [:b] => @options is {:a => {:b => {}}} populate :a => [:b, :c => :d] => @options is {:a => {:b => {}, :c => :d}} populate :a => [:a, :b, :c] => @options is {:a => {:a => {}, :b => {}, :c => {}}} populate :a => [:a, :b, "c"] => @options is {:a => [:a, :b, "c"]} populate :a => [:one], :b => [:two, :three => "four"] => @options is {:a => :one, :b => {:two => {}, :three => "four"}} populate :a => [:one], :b => [:two => {:four => :five}, :three => "four"] => @options is {:a => :one, :b => { :two => { :four => :five } }, :three => "four" } } It is acceptable if the signature of populate needs to change to accommodate some kind of recursive version. There is no limit to the amount of nesting that could theoretically happen. Any thoughts on how I might pull this off?

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  • Forbid links to open new tabs in Google Chrome

    - by Andrzej
    I'm looking for a solution to forbid links in Google Chrome to open new tabs (in most cases it is a target="_blank" issue). So, I want all links to open pages in currently active tab, not in new tab. I tried a wide range of addons (for ex. "Death to target=_blank") and greasemonkey scripts that are supposed to remove target=_blank attribute but none of them worked. It is extremally anoying when I want to switch between accounts in GMail or navigate from GMail to GDrive. I always get the new tab opened and I need to close last tab manually.

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  • use correct-resolution background desktop image

    - by Rob Bos
    I have a desktop background image (a picture) in a half-dozen different resolutions, that I'd like to deploy to a disparate collection of computers with different monitors and video cards and whatnot. Laptops, netbooks, desktops, widescreen, and even a couple of "tall" screens. I have images to cover most of the cases. I would like Windows 7 to correctly pick the correct desktop background image via group policy. Now, the logon screen is already done. The OEMBackground method is rather clever, and lets you copy files of different resolutions to the machine, and the logon app will calculate the aspect ratio of the monitor and match it to a file as closely as possible. Is there any way to have that functionality on the desktop background as well?

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  • Eclipse shows splash screen and closes. How to fix?

    - by Bozho
    Today I restarted my machine, and Eclipse (3.5, downloaded recently) shows a strange behaviour: shows splash screen for less than a sec quits This is in 100% of the cases, so I can't start Eclipse at all. Where can I find logs about this? I deleted all eclipse resources and re-unzipped it. Same thing. I have enough memory (IntelliJ runs fine), and my anti-virus software doesn't show any activity related to closing eclipse. Any ideas what might have caused this?

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  • Cursor and selection invisible if focus is lost

    - by Alois Mahdal
    "Latest" versions of Excel (I think it's since 2007) have a new added "feature" that if Excel windows loses focus, the cursor becomes invisible. Also coloring of headers is default, so it's impossible to locate cursor and/or selection as soon as I switch to other window. This annoys the hell out of me as it makes Excel almost unusable for most of tasks I need it for: keeping track of test cases while performing testing in another window. obtaining data somewhere else and porting it to Excel (I have never seen such behavior in other applications and can't even think of a justification for it.) Is is possible to turn this behavior off?

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  • Can an ESX server under heavy load cause cpu spikes on guest VM's?

    - by ReferentiallySeethru
    So we have a number of vm's running on an ESX 4.1 server for product testing. The ESX Server is at times under heavy load. We've been experiencing high CPU levels during some use cases, but we can't always duplicate this. If the ESX server as a whole is under heavy load could this cause guest machines to show high CPU usage? To ask it a different way, if the guest machines require more cpu resources than the server has, how does this affect CPU usage as indicated by the OS and process?

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  • Thunderbird "Folders" and "Inbox" font size

    - by bo gusman
    Graphical programs are such a pain sometimes. I am of an age where 1024x768 is the highest resolution that I can see. I had set my Windows 7 system fonts to be 125% - that helps a lot - but it screws up the tool bars on many other programs so I've reverted to 100% and it's now too hard to read in many cases. Most browsers will let you easily scale text font size as will the "message" window of Thunderbird (aside from setting the default font size for reading messages to 24 point, CTRL + + works wonders). However, I cannot seem to find a way to set the font size for the other panes - the Folders pane and the inbox pane. Is there some undocumented way to do that?

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  • how to recover data from my disk - I accidentally copied with dd an iso on it

    - by sijoune
    I wanted to create a bootable usb from an iso image and i accidentally put as the output of the dd, instead of my usb drive, one of my hard disks. The iso was 3,3 GB and my disk is 1TB! And it was almost full. Can i at least restore the data that has not been overwritten? Right now i can't even mount it. I get this error: Error mounting /dev/sdd1 at /media/main/UDF Volume: Command-line `mount -t "udf" -o "uhelper=udisks2,nodev,nosuid,uid=1000,gid=1000,iocharset=utf8,umask=0077" "/dev/sdd1" "/media/main/UDF Volume"' exited with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock on /dev/sdd1, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so Also since i know which filesystem my disk used if i reformat it to this filesystem is there any chance i can mount it and retrieve the rest of the files?

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  • Wifi Signal Strengths

    - by Phorce
    I hope that I have asked this question in the right topic. Basically I use BT (In the U.K.) and I have problems with my router receiving a strong signal in certain rooms of the house, which, therefore makes the internet really slow in some cases it won't work at all. I have had experience working with Virgin Media (UK) before and just changed the channel number and this worked fine, but, do not know if I would receive the same outcome on BT. Could anyone suggest any other things that I could try alongside of the channel change in order to /hopefully/ get a stronger signal, without having to install Ethernet cable?

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  • Which is the recommended filesystem for VMware Server / ESXi?

    - by elitalon
    We have a couple of servers in office with VMware Server as virtualization solution. We are planning an upgrade of our infrastructure. Some servers will remain with VMware Server, but we want to migrate some others to VMware ESXi. In both cases we are making a fresh install, and I wonder if there any suggestion/guidelines regarding the host filesystem and its partitions. EDIT: We are using local storage instead of SAN/NAS external storage, because we are not sure if it is worth it to use them given our office size/requirements.

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  • What security changes are necessary when connecting DSL modem directly to PC instead of router?

    - by Mike B
    Windows XP I have a user with a single PC that was connected to the internet via a standard home router. The router is now having hardware-related issues and to save money, they're considering connecting the PC directly to the DSL modem since they don't need to share the internet connection or need wireless functionality. If they decide to do that, I'm concerned that this will introduce additional security concerns. Is the Windows Firewall sufficient and Microsoft Security Essentials sufficient for protecting a computer directly connected to a DSL Modem? Or is other security software needed here? Ideally, I'd like to avoid having third-party firewall software constantly bringing up alerts and asking them to approve everything. Also, just to clarify, their use cases are just internet browsing and email.

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  • Automatically make user local administrator on their computer through GPO?

    - by Grant
    In our AD 2003 domain each user gets local admin permissions on their computer. Everyone else can login with their domain account as normal user. Right now this means going to the desktop and manually adding the user as a local administrator. Is there any way to automate this process through logon scripts or GPOs? I have found ways to use a gpo to make everyone who logs in to a computer a local admin, but really only want to give it to the primary user (or in some cases users) of the computer. I've also seen methods that required adding a group for each computer...but really dont want to clutter AD like that. I do have a list mapping each user to each computer name. If it matters the desktops are a mix of xp and win7.

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  • File type actions for ruby scripts

    - by Kovags
    Hello, I just installed the Ruby interpreter and created the file test.rb. In the Folder Options, I created the rb file type and an action called Run and assigned the application C:\Ruby192\bin\ruby.exe "%1"" So It's possible for to get into the Windows XP command line and run the script simply by doing this: C:\>test.rb But when I need to send parameters to the script, I can't simply do the following: C:test.rb parameter1 parameter2 I'll have to do the following instead: C:\Ruby192\bin\ruby.exe c:\test.rb parameter1 parameter2 I just noticed that I'm able to edit the action the following way to pass more parameters: C:\Ruby192\bin\ruby.exe "%1" "%2" "%3"" That allows me to give 2 parameters to the script, but for some cases I need to pass a handful of parameters and it doesn't seem right for me to append "%5" "%6" "%7" ad nauseam. What's the canonical way to do it?

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  • When NOT to use virtualisation? [closed]

    - by Nils
    When virtualisation was new, we tried to virtualized everything. Then came the cases where the virtual machine was very much slower than a physical one. It boils down to the following ruleset (with us) when not to virtualize: Network-io-intesive applications (i.e. with many interrupts/packets) Disk-io-intensive (if not on SAN storage) RAM-intensive (this is the most precious resource) Now this is true for a combination of XEN using local DRBD storage. The same seems to be true for Hyper-V using DAS. I wonder - is it true for all combinations - and what are your limits on these combinations?

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  • How can I prevent Apache from exposing a user's password?

    - by Marius Marais
    When using basic authentication (specifically via LDAP, but htpasswd also) with Apache, it makes the REMOTE_USER variable available to the PHP / Ruby / Python code underneath -- this is very useful for offloading authentication to the webserver. In our office environment we have lots of internal applications working like this over SSL, all quite secure. BUT: Apache exposes the PHP_AUTH_USER (=REMOTE_USER) and PHP_AUTH_PW variables to any application inside PHP. (PHP_AUTH_PW contains the plaintext password the user entered.) This means it's possible for the app to harvest usernames and passwords. Presumably the same information is available to Python and Ruby (all three are currently in use; PHP is being phased out). So how can I prevent Apache from doing this? One idea is to use Kerberos Negotiate authentication (which does not expose the password and has the benefit of being SSO), but that automatically falls back to Basic for some browsers (Chrome and in some cases Firefox), causing the password to be exposed again.

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  • Website is live but ping times out

    - by infinity
    I have a client's website that is running on GoDaddy hosting and started behaving very strange recently. The site is up and running but when I try to ping it I get time out. The problem is PayPal doesn't work also Google Webmaster reported the site is down. The client spoke with support and they said there is no firewall or any other traffic filter on their side. The site itself is PHP. Any ideas are welcome. I've tried to send test IPN from PayPal to the payment URL and got: IPN delivery failed. Unable to connect to the specified URL. Please verify the URL and try again. Which makes me think that the website/server is inaccessible in some specific cases. The site URL is http://www.flavourly.com P.S.: I tried to ping it from different machines, ISPs and OS

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