Reimplementation of the SixXS heartbeat protocol in shell (mksh, actually). Both client and server are provided.
This can be used as a client to the SixXS IPv6 Tunnel Service Provider instead of their heartbeat client or AICCU, or to build a tunnel solution by yourself. In addition, it has been successfully used to provide Dynamic DNS.
These details are provided for information only. No information here is legal advice and should not be used as such.