Dhd

The short version is:

terminal1$ nc -l 10000 # listen on port 10000 terminal2$ dhd -p 10001:localhost:10000 # proxy local port 10001 -> localhost:10000 terminal3$ nc localhost 10001 # connect to local port 10001

And now you'll get output like: 2013/03/09 08:00:26 tcp server starting

00000000: 68 65 6c 6c 6f 2c 20 77 6f 72 6c 64 0a |hello,.world.| <00000000: 68 65 6c 6c 6f 20 62 61 63 6b 0a |hello.back.|