Free tcp software for linux

This is a traffic generator. It is used to check what massive amounts of traffic of certain type will do to an intervening network.

It does not try to measure throughput or response times. It has been made with the question in mind: If 100 clients does simultaneous TCP transfers for 2 days, will my router break? Or can I configure my firewall while 50 people are doing large TCP transfers through the device?

GNet is a network library. It is object-oriented, written in C, and built upon GLib. It is intended to be easy to use and port. It supports abstract Internet addresses, TCP, UDP, IP Multicast, IPv6, asynchronous DNS lookups, SHA, MD5, Base64, URIs, and SOCKS.
It comes with documentation and examples.
Main features:
- TCP "client" and "server" sockets
- UDP and IP Multicast sockets
- High-level TCP connection and server objects
- Asynchronous socket IO
- Internet address abstraction
- Asynchronous DNS lookup
- IPv4 and IPv6 support
- Byte packing and unpacking
- URI parsing
- SHA and MD5 hashes
- Base64 encoding and decoding
- SOCKS support

hping is a command-line oriented TCP/IP packet assembler/analyzer. The interface is inspired to the ping(8) unix command, but hping isnt only able to send ICMP echo requests.
It supports TCP, UDP, ICMP and RAW-IP protocols, has a traceroute mode, the ability to send files between a covered channel, and many other features.
Main features:
- Firewall testing
- Advanced port scanning
- Network testing, using different protocols, TOS, fragmentation
- Manual path MTU discovery
- Advanced traceroute, under all the supported protocols
- Remote OS fingerprinting
- Remote uptime guessing
- TCP/IP stacks auditing
- hping can also be useful to students that are learning TCP/IP.
Enhancements:
- Fixed a problem with the checksum code. Some packet was generated with the wrong checksum! Please upgrade to rc3 ASAP.
- Scan mode. You can use hping as a low-level automated TCP port scanner. An example of output follows

SSL Proxy server listens on a TCP port, accepts SSL connections, and forwards them to another local or remote TCP port.
For example, it is possible to create an HTTPS server if you have an HTTP server and you run an SSL Proxy server on port 443 which forwards the connections to port 80.
SSL Proxys design makes it as secure as possible and still perform well.
Enhancements:
- Improved certificate handling (chained certificates are now supported), more error information on SSL protocol errors during SSL_accept(), -U and -D options (buffer size), and a "powered by" logo.

TCPWatch is a utility written in Python that lets you monitor forwarded TCP connections or HTTP proxy connections.
It displays the sessions in a window with a history of past connections. It is useful for developing and debugging protocol implementations and web services.
Enhancements:
- Made compatible with versions of tcl that have threads enabled.
- Log file numbers are now sequential.
- "user@host" is now accepted as a destination hostname (the user name is ignored).

prtunnel is a program that can tunnel TCP/IP connections in a variety of ways, including through HTTP and SOCKS5 proxy servers. Some if its possible uses include:
- Tunneling TCP connections from client programs to a remote server through an HTTP or SOCKS5 proxy (useful if youre behind such a proxy and want to use a program that doesnt have native proxy support)
- Tunneling TCP connections from SOCKS-capable client programs through an HTTP or SOCKS5 proxy
- Tunneling TCP connections from an IPv4 client program to an IPv6 server and vice-versa
- Forwarding TCP connections
- Running as a simple SOCKS proxy server
prtunnel project was developed and used under Linux and BSD-based operating systems.
Enhancements:
- A bug that would cause malloc(0) to be called in some situations (which could cause problems on some systems) has been fixed.
- The server timeout, if specified, is now set before the proxy server successfully connects to the remote server, which will prevent the program from hanging if the proxy does not respond to the client.

TCP port scanner is a network scanner for Linux.

Installation:

1. Install - become root and gunzip/tar tcpscan-X-Y-Z.tar.gz.
2. Type ./confugure , make
3. Type install
4. Enjoy and try type tcpscan localhost
5. To get help - run tcpscan without parametres.

Usage:

tcpscan [-f] [hostname || IP_address]
tcpscan [-f] [first_IP_address] [last_IP_address]