I am trying to use socat for creating a simple tunnel between 2 IPs in my home network.
2 VM running on VirtualBox
First machine BT5 IP :
Second machine Windows XP :

socat TCP-LISTEN:8080,fork
But when I hit browser with I get following error in console:
socat[8252] E unknown device/address ""

/dev/net/ls shows tun.

What do I need to do to make socat work !!