Hans IP over ICMPHans makes it possible to tunnel IPv4 through ICMP echo packets, so you could call it a ping tunnel. This can be useful when you find yourself in the situation that your Internet access is firewalled, but pings are allowed. Hans runs on Linux as a client and a server. It runs on Mac OS X, iPhone/iPod touch, FreeBSD, OpenBSD and Windows as a client only. Is is inspired by icmptx an