Socat - a Simple Tcp Proxy

In order to setup a simple TCP proxy, I've used the following :

yum install socat

socat TCP4-LISTEN:2003,fork TCP4:app.graphite.lpdomain.com:2003

This listen to port 2003 and send everything to the remote server app.graphite.lpdomain.com , to remote port 2003

I've done that in order to be able to send metric value to a remote graphite server that was not accessible from my server.
In order to send value to graphite , I've used the following :

echo Centralized.service.sandbox.test3   1234  `date +%s --date='30 minutes ago'` | nc -v my-proxy-server 2003

BTW, I was also suggested to use nc command, but it appears that this proxy tool is more primitive and doesn't support multiple connection apparently :

mkfifo backpipe
nc -k -l 2003    <backpipe | nc app.graphite.lpdomain.com 2003  1>backpipe