Transmission Control Protocol (TCP) and Internet Protocol (IP) provide end-to-end connectivity specifying how data should be formatted, addressed, transmitted, routed and received at the destination.

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TCP/IP Drivers for QNX 4.2

Does anyone have, or know where I can get my hands on TCP/IP Drivers for QNX 4.2 qnx.com wants ~ $400 for the drivers.. I'm hoping someone has written their own or knows of some good free ones.
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How to change TCP “time wait” delay in Windows 7 / 2008 Server?

Windows Server 2003 "offers two methods of controlling TIME-WAIT behavior." The TcpTimedWaitDelay registry value under the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters ...
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746 views

DatabasePath Registry Entry Not Working in Windows 7

I’ve set the HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\DatabasePath registry entry in Windows XP and it works as expected; the system loads and uses the HOSTS file in the directory I’ve ...
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104 views

Opening multiple web links causes pages to 404 or timeout

I'm using chrome/firefox on windows 7, on fiber, at the office. When browsing the web and opening multiple concurrent pages some of them will 404, timeout, or hang. This doesn't seem to happen to ...
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Does Windows XP only allow 10 inbound TCP/IP connections at any one time?

I tried to connect 40 clients to a webservice that is on Windows XP and I get no connection. Are the inbound TCP/IP connections on Windows XP limited to 10 at any one time?
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624 views

Detect changes to routing table or address resolution protocol on Windows 7

On two different Win7 PCs we're having a very specific problem where connecting a device which uses a RNDIS driver sometimes disrupts the PC's network adapter connection (we detect this because we ...
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377 views

Random BSOD, even when the computer idles

I get a random BSOD, even when the computer idles. Already tried: memtest - ok scandisk - ok netsh int ip reset Winsock fix. tcpip.sys+2c13e 21.06.2011 15:21:00 DRIVER_IRQL_NOT_LESS_OR_EQUAL ...
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SQL Server Ports

The Microsoft website states The firewall must be configured to permit port 1433 incoming (or the port numbers that SQL Server listens to on TCP/IP), and ports 1024 to 65535 outgoing. Does this ...
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what is TCP Half Open Connection and TCP half closed connection

I am trying to understand what is the difference between TCP Half Open Connection and TCP Half closed connection can any one tell what exactly are they?
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11answers
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What's the difference between a TCP segment and a TCP packet?

Is a TCP segment not part of a TCP packet? Here's what I've read: A segment is a piece of application data chopped into a transportable size by TCP and wrapped with a TCP header Isn't the TCP ...
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1answer
244 views

TCP/IP for windows and unix

Are the protocol implementations in TCP/IP same for all platforms or is there a specific requirement for each platform? I have this question when I read Windows and UNIX use different functions to ...
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why does my time warner cable modem connection enter dead period states every 20 mins?

My wifi connection (from my MacBook running Snow Leopard) to a Time Warrner cabel model and router has a recurring connection problem. Every 20 minutes or so it will enter a "dead state" where no ...
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How to keep a static network local IP for all the connected machines, and still dynamically assign all the incoming ones?

I have read the manual and could find no word on this, so I'm asking here. I have a couple Macs on a wireless network, this router model: http://homesupport.cisco.com/en-us/wireless/lbc/WRT54GL Now, ...
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3answers
3k views

What are the other computer communication protocols other than TCP/IP?

What are the other computer communication protocols except for TCP/IP? I know about only this and in interview they asked me about Can two PC's communicate without TCP/IP protocol suite and I did not ...
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2k views

Why has Microsoft never implemented a loopback interface in Windows?

First things first: I know that you can install a sort-of-a Loopback Adapter in Windows. But what I really found strange is that there exists nothing like lo on Windows. At all. From The missing ...
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2k views

network will not work properly after having run TCP optimizer, but safe mode settings work perfectly. how to restore?

I was experiencing some issues with my connection while playing online and I tried to optimize it by running TCP optimizer on my PC (Windows 7 64bit professional). I thought maybe the situation could ...
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2answers
213 views

is there a single-end available bandwidth measurement tool

i am doing my graduation thesis,currently i need a tool that is capable of measuring the available bandwidth between client and servers.i have googled that, the link ...
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1answer
3k views

Adding a second network card (dedicated connection to a network music streaming device) to a PC already on a home wireless network

I have a pretty normal home wireless network with a combined adsl modem/router which all my (Windows XP/Vista) computers use DHCP to connect wirelessly to and share resources among each other in a ...
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1answer
107 views

Is it possible for a programmer to know the network capacity?

I am interested in knowing the maximum bandwith of our network. Can I use some freely downloadable utility or tool to find out if my intranet is 100BASET or 1000BASET, etc. or what is the maximum ...
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1answer
55 views

Is there a way to know WHEN a connection has been established?

I'm working with mobile IPv6 and was dealing with lots of zombie connections. I set keepAlive to true and want to test whether old connections are being discarded. I'm using lsof to list the process ...
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2answers
3k views

Using localhost TCP/IP communication in a program - always safe?

I have an application which is separated to several parts (processes) communicating over TCP/IP, using a pre-defined port on localhost. Is this always safe? Can some kind of a firewall (corporate, ...
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3answers
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Windows Vista: TCP/IP stack is smashed, how to reinstall the LAN-Devices?

the TCP/IP stack is smashed, thats why no LAN-Connections are running. I want to download the LAN drivers from another computer and uninstall and reinstall the LAN devices on this system. Hopefully ...
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TCP segment of a reassembled PDU

In wireshark sometimes I see this: 478195 5738.896809 192.168.1.79 61.213.44.124 TCP [TCP segment of a reassembled PDU] What is a PDU? Was it reassembled? What does this mean?
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Is there a hard limit of 65536 open TCP connections per IP address on linux?

Is there a hard limit of 65536 open TCP connections per IP address on linux? I read somewhere that there was, but someone is asking for confirmation and i just can't find it. I seem to remember it ...
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291 views

my tcpdump always filters packets?

I've been using tcpdump for about a month now, and recently, it has stopped capturing any packets that were not sent to or from the computer running tcpdump. I've stripped down my command to just: ...
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140 views

TCP source and destination ports switch

Why do i see source and destination ports switching with each other in a packet capturing application?
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361 views

trace program network communications

I'm looking for a program that can trace what a specific program on my computer is sending/receiving over my Ethernet connection. I'm not trying to crack a password or anything. Thanks
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Why is Windows' default IP address 169.xx.xx.xx?

My Windows system got an 169.xx.xx.xx IP address the other day, and I fixed the issue, but why did Microsoft chose this address as the default? Why not 1.xx.xx.xx or 255.xx.xx.xx? Did one guy at ...
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719 views

Cannot open any web page, but MSN Messenger works

I use my computer behind a router. My MSN program can connect to the Internet, but I can not open any web site with my web browser. It seems that this problem is related to DNS because when I input an ...
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666 views

Why is a network ID not needed to connect to an IP address?

I know how IP basically works, and knows that an IP address composed of a network ID portion and a host ID portion, but when I type a IP address, say 8.8.8.8 into the web browser, I didn't supply any ...
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3answers
541 views

Need to track total data transfer using Windows 7 [duplicate]

Possible Duplicate: Software to report internet traffic for home user I'm looking for a utility that can run in Win 7 and tell me how much data transfer my machine does per month. Any ...
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1answer
130 views

Can I set up a COM Port that Connects via TCP/IP?

I have an RS232 device connected to a Digi PortServer on my network. I can telnet to the Digi's IP and port number to communicate with that RS232 device. I have a Windows application that knows how ...
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Why can't I ping a PC on my home network?

Whenever I try to ping another box on my home network, it pings the wrong ip address: C:\Users\Papa>ping macmini Pinging macmini.belkin [208.68.143.55] with 32 bytes of data: Reply from ...
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What to you use as a “fuser -v -n tcp” alternative on Mac OS X

The fuser command on Mac OS X is rather primitive and can't check for processes listening on a specific port. Does anybody know a good alternative? It it enough to know which process listening on that ...
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646 views

Force command-line tool to use different interface?

I have a service which I want to run over eth1. But all my other traffic still needs to run over eth0. Is it possible to force a command-line tool or other application to use the non default ...
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2k views

Nmap “operation not permitted” error

I'm running CentOS 5.3 in an openVZ container, and I'm receiving "operation not permitted" errors from Nmap. [root@test nmap-5.21]# ./nmap scanme.nmap.org Starting Nmap 5.21 ( http://nmap.org ) ...
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How to create a TCP tunnel in windows to allow remote->local connections in NAT environment?

So I know about SSH tunneling via a remote Linux server to reach sites which are blocked in my local network. My question is the other way around: I have a webserver running locally, which I can ...
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3answers
359 views

XP Pro will not allow Hamachi or skype connections but internet and other apps ok

XP Pro version has both wireless and LAN connections. Both work well for all traffic(web, mail, update servers, telnet... etc.) However both Skype and Hamachi fail to resolve. Opened the firewall ...
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871 views

How to ssh in the face of huge (25 second) latency?

I need to create an ssh connection between two Linux machines running Centos v5 but the latency could be as high as 25 seconds. I find that if I test something approaching this configuration ...
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1answer
373 views

Program that listens to a TCP/IP port for text and execute (emulate) a key stroke on keyboard?

I am looking for a program to be run on Windows Vista that would listens to a TCP/IP port and execute or emulate a keyboard's key stroke (or a combination of keystrokes, such as Ctrl + D). It's like ...
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Why a single(?) TCP packet gets split to multiple PDU units here?

Pic related: Why those segments are marked as separate packets (all Ack, Seq=509)? Why did a packet get split?
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Is the MAC address used on the DLL layer unique throughout the world for a device, lets say this computer?

Is the MAC address used on the DLL layer unique throughout the world for a device, lets say this computer?
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Difference between localhost and the ip address

If bind a socket in Python to localhost,8200 this is accessible via http://localhost:8200/. but not http://x.x.x.x:8200/ If bind a socket in Python to x.x.x.x,8200, machinename,8200 this is ...
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7answers
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Windows 7: How to solve IPv6 “No network access” problem?

I'm tearing my hair out on this one. Basically I need IPv6 to work on a Windows 7 (Home Premium) Dell laptop and it isn't. I have the wireless networking all working but if I click on the wireless ...
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2answers
685 views

Is `ip` to supersede `ifconfig`

A friend of mine said that ip is supposed to be the successor of ifconfig and iwconfig — yet I found no Wikipedia article about it and have never seen anyone mention or recommend it online even though ...
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How to find the MAC address of a remote computer?

I know the IP address of a host on my own LAN. Using that, how can I find its MAC address (without having to physically access it)?
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NIC recommendation and advice for building network packet capture PC

Greetings, I am trying to build a dedicated PC for capturing and recording network packets in a heavily loaded test environment. I am expecting total data loads to be between 150-200Mbps and want to ...
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How do you block specific urls and not entire domain

I want block a URL on specific computer, in this case www.google.com/reader but i not want to block the entire domain of google. It is for my work machine as I don't seem to have enough self control ...
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How do I rebuild the TCP/IP stack on XP?

Consider a computer has been hit with a spyware bomb and it has destroyed the internet connectivity in almost every way. (no ethernet, wireless, or dial-up) Because it would take forever to backup ...
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What are CLOSE_WAIT and TIME_WAIT states?

When I do netstat -a on my Windows machine, I get a listing of the ports with one of the four states: LISTENING CLOSE_WAIT TIME_WAIT ESTABLISHED What do CLOSE_WAIT and TIME_WAIT mean/indicate?