Tcp

SmartSniff
Free - NirSoft Freeware

SmartSniff allows you to capture TCP/IP packets that pass through your network adapter, and view the captured data as sequence of conversations between clients and servers. You can view the TCP/IP conversations in Ascii mode (for text-based protocols, like HTTP, SMTP, POP3 and FTP.) or as hex dump. (for non-text base protocols, like DNS)

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XP TCP/IP Repair
Free - Waresoft Software

Is Spyware and/or Adware messing up your internet connection after you have uninstalled it? Has your internet connection slowed down and you just don't know why? Have you used an Internet Optimizer that just didn't optimize your internet, instead it made it slower? If you answered yes to any of the questions above, then XP TCP/IP Repair may help fix your internet connection and possibly even protect your privacy.

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TCP Optimizer
Free - Speed Guide, Inc.

TCP Optimizer is a free, easy to use Windows program that helps tune and optimize your Internet connection. The program can help bothe the novice and advanced user chang related TCP/IP Registry parameters, such as the TCP Receive Window, MTU, even QoS and ToS/Diffserv prioritizatioin. There is no installation required, just download and run.

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Mobile TCP
Free - Klocktornet AB

Most used for forwarding SMTP connections from your mail program to the correct SMTP server, but you could forward any port type. Mobile TCP can also change your workgroup. Everything depends on what network you are currently connected to. Mobile TCP operates from the tray There is no nag screens, unwanted requesters or irritating sounds. Settings are straight forward.

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CurrPorts
Free - NirSoft Freeware

CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer. For each port in the list, information about the process that opened the port is also displayed, including the process name, version information, the user that created it, and more. In addition, CurrPorts allows you to close unwanted TCP connections, kill the process that opened the ports, and save the TCP/UDP ports list to HTML file, and more.

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HS X.25 C Source Library
Free - Hillstone Software

HS X.25 is a software library in C (supplied with full source code) which implements ITU-T recommendation X.25 - Interface between Data Terminal Equipment (DTE) and Data Circuit-terminating Equipment (DCE) for terminals operating in the packet mode and connected to public data networks by dedicated circuit. Includes HsDL (Data Link) and HsSock (Winsock interface) for X.25 over IP applications (XOT))

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