Ptunnel is an free and open source application that allows you to reliably tunnel TCP connections to a remote host using ICMP echo request and reply packets, commonly known as ping requests and replies.NOTE: Ptunnel is licensed and provided under the terms of the BSD License.What\'s New in This Release: [ read full changelog ]· Added rudimentary support for tunneling over UDP port 53. This may or may not be useful.· Added built-in support for compiling on Windows, thanks to Mike Miller.· Added syslog support, also courtesy of Mike Miller.· Experimental support for spoofing the source IP address. The source address must be explicitly configured in the source code, and it might not work (which is why it\'s experimental). To enable, define kPT_add_iphdr to 1.