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  • Hold a network connection although IP address change

    - by rursw1
    Hi, Is it possible to hold an open TCP connection with a client, while the IP address of the client is externally changed? For example, the connection is establishes against address X, but somewhen while the connection is open, the client-side user asks for IP renew and gets another IP address. Can the connection remains alive in this case? Thanks in advance.

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  • Passing message over network

    - by Sylvestre Equy
    Hi, I'm currently trying to develop a message-oriented networking framework and I'm a bit stuck on the internal mechanism. Here are the problematic interfaces : public interface IMessage { } public class Connection { public void Subscribe<TMessage>(Action<TMessage> messageCallback); public void Send<TMessage>(TMessage message); } The Send method does not seem complicated, though the mechanism behind Subscribe seems a bit more painful. Obviously when receiving a message on one end of the connection, I'll have to invoke the appropriate delegate. Do you have any advice on how to read messages and easily detect their types ? By the way, I'd like to avoid to use MSMQ.

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  • Neural Network: Handling unavailable inputs

    - by Mike
    Hopefully the last NN question you'll get from me this weekend, but here goes :) Is there a way to handle an input that you "don't always know"... so it doesn't affect the weightings somehow? Soo... if I ask someone if they are male or female and they would not like to answer, is there a way to disregard this input? Perhaps by placing it squarely in the centre? (assuming 1,0 inputs at 0.5?) Thanks

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  • Solution to route/proxy SNMP Traps (or Netflow, generic UDP, etc) for network monitoring?

    - by Christopher Cashell
    I'm implementing a network monitoring solution for a very large network (approximately 5000 network devices). We'd like to have all devices on our network send SNMP traps to a single box (technically this will probably be an HA pair of boxes) and then have that box pass the SNMP traps on to the real processing boxes. This will allow us to have multiple back-end boxes handling traps, and to distribute load among those back end boxes. One key feature that we need is the ability to forward the traps to a specific box depending on the source address of the trap. Any suggestions for the best way to handle this? Among the things we've considered are: Using snmptrapd to accept the traps, and have it pass them off to a custom written perl handler script to rewrite the trap and send it to the proper processing box Using some sort of load balancing software running on a Linux box to handle this (having some difficulty finding many load balancing programs that will handle UDP) Using a Load Balancing Appliance (F5, etc) Using IPTables on a Linux box to route the SNMP traps with NATing We've currently implemented and are testing the last solution, with a Linux box with IPTables configured to receive the traps, and then depending on the source address of the trap, rewrite it with a destination nat (DNAT) so the packet gets sent to the proper server. For example: # Range: 10.0.0.0/19 Site: abc01 Destination: foo01 iptables -t nat -A PREROUTING -p udp --dport 162 -s 10.0.0.0/19 -j DNAT --to-destination 10.1.2.3 # Range: 10.0.33.0/21 Site: abc01 Destination: foo01 iptables -t nat -A PREROUTING -p udp --dport 162 -s 10.0.33.0/21 -j DNAT --to-destination 10.1.2.3 # Range: 10.1.0.0/16 Site: xyz01 Destination: bar01 iptables -t nat -A PREROUTING -p udp --dport 162 -s 10.1.0.0/16 -j DNAT --to-destination 10.3.2.1 This should work with excellent efficiency for basic trap routing, but it leaves us completely limited to what we can mach and filter on with IPTables, so we're concerned about flexibility for the future. Another feature that we'd really like, but isn't quite a "must have" is the ability to duplicate or mirror the UDP packets. Being able to take one incoming trap and route it to multiple destinations would be very useful. Has anyone tried any of the possible solutions above for SNMP traps (or Netflow, general UDP, etc) load balancing? Or can anyone think of any other alternatives to solve this?

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  • How to connect the printer HP 2575 to a network?

    - by Peter
    I have 2 PCs and a router and I want to connect my HP 2575 to this network. So, I found a network cable and I connected the printer to the router. I access the router and I can see that the printer is connected. My question is: How can I use the printer, from one of my computer. I tried Add Printer feature, but with no luck. Any ideas?

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  • How do I map a network drive in Ubuntu? I want to save my Firefox downloads directly in the mapped n

    - by NJTechie
    I work in an environment wherein files are exchanged over email which are then processed into databases. In Windows, mapping a network drive and storing files directly to a folder in the network drive from Firefox/Chrome downloads is a breeze. How to achieve the same in Ubuntu? I don't see the SFTP'ed drive/directory as options in Firefox- Downloads setup. Thanks in advance!

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  • How do I map a network drive in Ubuntu? I want to save my Firefox downloads directly in the mapped n

    - by NJTechie
    I work in an environment wherein files are exchanged over email which are then processed into databases. In Windows, mapping a network drive and storing files directly to a folder in the network drive from Firefox/Chrome downloads is a breeze. How to achieve the same in Ubuntu? I don't see the SFTP'ed drive/directory as options in Firefox- Downloads setup. Thanks in advance!

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  • On a local network, are you able to password protect certain folders and how (in windows xp)?

    - by Derek
    I have a local network set up for my small office which consists of me, the manager, my wife, the secretary, and a few sales people/others. I would like to share passwords over the network and other such things privately to my wife, the secretary, but would not like the sales people and others to have access to it, yet I need the others to have access to other folders/documents that I'd like to share. How would I go about doing this if not by password? Thanks in advance

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  • How to track a network users accessability on a document?

    - by BigBoy
    We have a document on common folder (Linux as server) on a network which can be accessed by log-in users. Is there way to track the users who really accessed (read/copy operations only) the document? We can log the users who accessed the network, but not sure if they really viewed/copied the document. How can we check this?

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  • What can SNMP be useful for in a small network?

    - by Sanoj
    I have been administering servers and clients in small business offices, and have never used SNMP. But I have read about it and it looks interesting. As what I understand, it is mostly useful if you have a bigger network with a lot of network equipment that should be monitored. Is there any useful use cases for SNMP in smaller networks? And is it recommended that I use it?

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  • What is the best way/tool to analyze raw data(network stats) from Simulation?

    - by user90500
    After running a simulation(using a simulator(QualNet)) of a simulated network I end up with ip stats stored in a database, I then extract the data to a csv file So now I have 750mb of raw network stats(time stamp, packet id, source ip, source port, protocol, etc). What are the common ways of analyzing large amounts of data like above, if you want to know things like packet loss, throughput, delay, congestion, etc.

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  • Corliss Expert Group Home Security: How to Secure Your Home without Spending Too Much?

    - by Mika Esmond
    HOME SECURITY: HOW TO SECURE YOUR HOME WITHOUT SPENDING TOO MUCH Imagine if there were no burglar or criminals who threaten the safety of our homes; we will be surprised how much savings we would have on several things we do to secure ourselves and our loved ones. We would not need fences, gates with locks, doors locks, window grills, CCTV cams, perimeter lighting, shotguns and baseball bats. The cost of maintaining these things can run up to the entire cost of building another room or, in some cases, a whole new house. The rationale for home security is the same for national security. A nation maintains an army whether it has enemies or not; so, whether burglars will come or not, we have to prepare for the eventuality. Hence, we end up spending for something we might never put into the actual use it was intended for. You buy a pistol and when a burglar breaks in you fire the gun either to scare or disable the intruder. We hope we will never have to use these things; but we still buy them for the peace of mind that comes from knowing we can secure or protect our family and home.

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  • What does it mean whether network device is Loopback?

    - by Gtker
    Does it mean that the Loopback device handles the request like ping localhost ? If so, there should be at least one device that's loopback,but seems none of my two network device is Loopback: rpcap://\Device\NPF_{45D5ADA0-095E-49F3-BEA1-E8754390F2D4} Description: Network adapter 'Intel(R) PRO/Wireless 2200BG Network Conne ction (Microsoft's Packet Scheduler) ' on local host Loopback: no rpcap://\Device\NPF_{783C5467-4026-473C-86A0-5E5A3708C624} Description: Network adapter 'Realtek RTL8169/8110 Family Gigabit Ethern et NIC (Microsoft's Packet Scheduler) ' on local host Loopback: no Can someone clarify all this?

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  • Security Trimmed Cross Site Collection Navigation

    - by Sahil Malik
    Ad:: SharePoint 2007 Training in .NET 3.5 technologies (more information). This article will serve as documentation of a fully functional codeplex project that I just created. This project will give you a WebPart that will give you security trimmed navigation across site collections. The first question is, why create such a project? In every single SharePoint project you will do, one question you will always be faced with is, what should the boundaries of sites be, and what should the boundaries of site collections be? There is no good or bad answer to this, because it really really depends on your needs. There are some factors in play here. Site Collections will allow you to scale, as a Site collection is the smallest entity you can put inside a content database Site collections will allow you to offer different levels of SLAs, because you put a site collection on a separate content database, and put that database on a separate server. Site collections are a security boundary – and they can be moved around at will without affecting other site collections. Site collections are also a branding boundary. They are also a feature deployment boundary, so you can have two site collections on the same web application with completely different nature of services. But site collections break navigation, i.e. a site collection at “/”, and a site collection at “/sites/mySiteCollection”, are completely independent of each other. If you have access to both, the navigation of / won’t show you a link to /sites/mySiteCollection. Some people refer to this as a huge issue in SharePoint. Luckily, some workarounds exist. A long time ago, I had blogged about “Implementing Consistent Navigation across Site Collections”. That approach was a no-code solution, it worked – it gave you a consistent navigation across site collections. But, it didn’t work in a security trimmed fashion! i.e., if I don’t have access to Site Collection ‘X’, it would still show me a link to ‘X’. Well this project gets around that issue. Simply deploy this project, and it’ll give you a WebPart. You can use that WebPart as either a webpart or as a server control dropped via SharePoint designer, and it will give you Security Trimmed Cross Site Collection Navigation. The code has been written for SP2010, but it will work in SP2007 with the help of http://spwcfsupport.codeplex.com . What do I need to do to make it work? I’m glad you asked! Simple! Deploy the .wsp (which you can download here). This will give you a site collection feature called “Winsmarts Cross Site Collection Navigation” as shown below. Go ahead and activate it, and this will give you a WebPart called “Winsmarts Navigation Web Part” as shown below: Just drop this WebPart on your page, and it will show you all site collections that the currently logged in user has access to. Really it’s that easy! This is shown as below - In the above example, I have two site collections that I created at /sites/SiteCollection1 and /sites/SiteCollection2. The navigation shows the titles. You see some extraneous crap as well, you might want to clean that – I’ll talk about that in a minute. What? You’re running into problems? If the problem you’re running into is that you are prompted to login three times, and then it shows a blank webpart that says “Loading your applications ..” and then craps out!, then most probably you’re using a different authentication scheme. Behind the scenes I use a custom WCF service to perform this job. OOTB, I’ve set it to work with NTLM, but if you need to make it work alternate authentications such as forms based auth, or client side certs, you will need to edit the %14%\ISAPI\Winsmarts.CrossSCNav\web.config file, specifically, this section - 1: <bindings> 2: <webHttpBinding> 3: <binding name="customWebHttpBinding"> 4: <security mode="TransportCredentialOnly"> 5: <transport clientCredentialType="Ntlm"/> 6: </security> 7: </binding> 8: </webHttpBinding> 9: </bindings> For Kerberos, change the “clientCredentialType” to “Windows” For Forms auth, remove that transport line For client certs – well that’s a bit more involved, but it’s just web.config changes – hit a good book on WCF or hire me for a billion trillion $. But fair warning, I might be too busy to help immediately. If you’re running into a different problem, please leave a comment below, but the code is pretty rock solid, so .. hmm .. check what you’re doing! BTW, I don’t  make any guarantee/warranty on this – if this code makes you sterile, unpopular, bad hairstyle, anything else, that is your problem! But, there are some known issues - I wrote this as a concept – you can easily extend it to be more flexible. Example, hierarchical nav, or, horizontal nav, jazzy effects with jquery or silverlight– all those are possible very very easily. This webpart is not smart enough to co-exist with another instance of itself on the same page. I can easily extend it to do so, which I will do in my spare(!?) time! Okay good! But that’s not all! As you can see, just dropping the WebPart may show you many extraneous site collections, or maybe you want to restrict which site collections are shown, or exclude a certain site collection to be shown from the navigation. To support that, I created a property on the WebPart called “UrlMatchPattern”, which is a regex expression you specify to trim the results :). So, just edit the WebPart, and specify a string property of “http://sp2010/sites/” as shown below. Note that you can put in whatever regex expression you want! So go crazy, I don’t care! And this gives you a cleaner look.   w00t! Enjoy! Comment on the article ....

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  • SQL SERVER – Quiz and Video – Introduction to SQL Server Security

    - by pinaldave
    This blog post is inspired from Beginning SQL Joes 2 Pros: The SQL Hands-On Guide for Beginners – SQL Exam Prep Series 70-433 – Volume 1. [Amazon] | [Flipkart] | [Kindle] | [IndiaPlaza] This is follow up blog post of my earlier blog post on the same subject - SQL SERVER – Introduction to SQL Server Security – A Primer. In the article we discussed various basics terminology of the security. The article further covers following important concepts of security. Granting Permissions Denying Permissions Revoking Permissions Above three are the most important concepts related to security and SQL Server.  There are many more things one has to learn but without beginners fundamentals one can’t learn the advanced  concepts. Let us have small quiz and check how many of you get the fundamentals right. Quiz 1) If you granted Phil control to the server, but denied his ability to create databases, what would his effective permissions be? Phil can do everything. Phil can do nothing. Phil can do everything except create databases. 2) If you granted Phil control to the server and revoked his ability to create databases, what would his effective permissions be? Phil can do everything. Phil can do nothing. Phil can do everything except create databases. 3) You have a login named James who has Control Server permission. You want to elimintate his ability to create databases without affecting any other permissions. What SQL statement would you use? ALTER LOGIN James DISABLE DROP LOGIN James DENY CREATE DATABASE To James REVOKE CREATE DATABASE To James GRANT CREATE DATABASE To James Now make sure that you write down all the answers on the piece of paper. Watch following video and read earlier article over here. If you want to change the answer you still have chance. Solution 1) 3 2) 1 3) 3 Now compare let us check the answers and compare your answers to following answers. I am very confident you will get them correct. Available at USA: Amazon India: Flipkart | IndiaPlaza Volume: 1, 2, 3, 4, 5 Please leave your feedback in the comment area for the quiz and video. Did you know all the answers of the quiz? Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Joes 2 Pros, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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  • Windows 7 Unidentified Network problem. Cannot connect to the internet.

    - by Gordon
    This is my first time on this website, but I was told this was a good place to ask this. I basically have a problem with Windows 7 connecting to my home network. It keeps identifying my home network as unidentified, and it continually does "identifying" until it simply say cannot connect to the Internet. I don't know how this problem occurred. It simply happened one morning. I am running Windows 7 Ultimate. I have a Realtek Network adapter. I don't think its the drivers. I have already tried system restore to a date when my computer was working fine but it still didn't fix the problem. From what Ive read online there was this bug in the services.msc area, something to do with Bonjour service. I cannot find either so I do not think that was the problem. I'll be online for a while, so I can provide any additional details if needed. I don't really know how to explain it because its so fudging complicated. I really appreciate clear and open steps to solving this. I have tried some things like system restore and rolling back drivers, doesn't seem to help.

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  • Share Folders & Files Between Vista and XP Machines

    - by Mysticgeek
    Since Microsoft has three operating systems in use, chances are you’ll find yourself needing to share files between XP, Vista, Windows 7, or some combination of the three. Here we take a look at sharing between a Vista and XP on your home network. Share Without Password Protected Sharing If you’re not worried about who’s accessing the files and folders, the easiest method is to disable Password Protected Sharing. So on the Vista machine open Network and Sharing Center. Under Sharing and Discovery make sure Network Discovery, File Sharing, and, Public Folder Sharing are turned on. Also turn off Password Protected Sharing… Now go into the Vista Public folder, located in C:\Users\Public, and add what you want to share or create a new folder. In this example we created a new folder called XP_Share and added some files to it. On the XP machine go into My Network Places and under Network Tasks click on View Workgroup Computers. Now you’ll see all of the computers on your network which should be part of the same Workgroup. Here we need to double-click on the Vista computer. And there we go…no password to enter so we can access the XP_Share folder or anything else that is located in the Public folder. Share with Password Protected Sharing If you want to keep Password Protected Sharing turned on, then we need to do things a little different. When it’s turned on and you try to access the Vista machine from XP, you’re prompted for a password, and no matter what you think the credentials are, you can’t get access…very annoying. So what we need to do is add the XP Machine as a user. Right-click on Computer from the Start Menu or desktop icon and select Manage from the context menu. The Computer Management screen opens up and you want to expand Local Users and Groups, then the Users folder. Then right-click any open area an select New User. Now create a new user name and password, you can also fill in the other fields if you want. Then make sure to uncheck User must change password at next logon and check the box next to Password never expires. Click the Create button and close out of the New User screen. You’ll then see the new user we created in the list and you can close out of the Computer Management window. Now back on the XP computer when you double-click on the Vista machine, your prompted to log in. Just type in the username and password you just created. Now you’ll have access to the Public folder contents. Set up Sharing on XP If you want to access a shared folder from the Vista computer located on the XP machine, it’s the same process in reverse. On the XP computer in Shared Documents, right-click on the folder you want to share and select Sharing and Security. Then select the radio button next to Share this folder and click Ok. Go into Computer Management and create a new user… Now from the Vista machine double click on the XP machine icon, enter the password, then access the folders and files you need. If you have multiple versions of Windows on your home network, you’ll now be able to access files and folders from each of them. If you want to share between Windows 7 and XP check out our article on how to share files and printers between Windows 7 and XP. You might also want to check out our article on how to share files and printers between Windows 7 and Vista. Similar Articles Productive Geek Tips Show Hidden Files and Folders in Windows 7 or VistaHow To Share Files and Printers Between Windows 7 and VistaShare Files and Printers between Windows 7 and XPHow To Share a Folder the XP Way in Windows VistaMoving Your Personal Data Folders in Windows Vista the Easy Way TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips Revo Uninstaller Pro Registry Mechanic 9 for Windows PC Tools Internet Security Suite 2010 PCmover Professional Scan your PC for nasties with Panda ActiveScan CleanMem – Memory Cleaner AceStock – The Personal Stock Monitor Add Multiple Tabs to Office Programs The Wearing of the Green – St. Patrick’s Day Theme (Firefox) Perform a Background Check on Yourself

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  • Windows Security Compliance Manager Released

    Microsoft rolled out the Security Compliance Manager tool on Thursday to help IT pros manage baseline security in Windows....Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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