Well the question is then what's the point other than a personal exercise?
There is plenty of ICMP / multi protocol tunnels software out there for both linux and windows much of it doesn't require administrative privileges.
Also ptunnel comes standard with some linux distro's these days Ubuntu and so do probably most of it's derivatives, and as far as raw performance goes ptunnel is also the highest performing one capable of achieving about 150kbps which isn't that bad considering the sheer amount of packets and overhead you get.
Also ptunnel comes standard with some linux distro's these days Ubuntu and so do probably most of it's derivatives, and as far as raw performance goes ptunnel is also the highest performing one capable of achieving about 150kbps which isn't that bad considering the sheer amount of packets and overhead you get.
http://manpages.ubuntu.com/manpages/gutsy/man8/ptunnel.8.htm...