NAME
tcpmultiplexer − Multiplexer/Demultiplexer for tcp connections
SYNOPSIS
tcpmultiplexer −s −l port −h hostname
tcpmultiplexer −c −l port −h servername −p serverport −k service|port
DESCRIPTION
Tcpmultiplexer implements TCPMUX protocol between two instances of
itself in order to do multiplexing and demultiplexing of tcp connec‐
tions. It can be runned both in server and in client mode.
When running in client mode, it opens locally port port, and tunnels
incoming connections to servername (listening on serverport) requesting
a service or a port.
When running in client mode, it opens locally port port and tunnels
incoming connection to the port requested by client instance on the
host hostname
Client and server instances of tcpmultiplexer communicate using TCPMUX
protocol (RFC 1078).
EXAMPLES
Bob has an Internet connection that permits him to open only one port,
e.g .4000, towards Internet. On his machine, he runs ftp server at port
21, http server at port 80, and another http server on port 15. He
wants to connect from outside to these servers but he can put only one
of this on port 4000. How to do?
First, runs server instance of tcpmultiplexer on port 4000
tcpmultiplexer −s −l 4000 −h localhost
Then, from anywhere in the world, he runs these commands:
tcpmultiplexer −c −l 100 −h ip.of.bob.machine −p 4000 −k ftp
tcpmultiplexer −c −l 200 −h ip.of.bob.machine −p 4000 −k www
tcpmultiplexer −c −l 300 −h ip.of.bob.machine −p 4000 −k 15
Now, Bob can connect to http://localhost:200 to browse his http server,
of ftp://localhost:100 to access to his files, etc.