ipip - an IP over IP encapsulation daemon
This is a user-space daemon that supports encapsulation of IP over IP.
Modern Linux kernels provide this ability in the kernel, but consume an
interface per encapsulated link. This can be impractical for virtual
networks built up of a large number of encapsulated links, such as is
the case with the amateur radio net-44 network. The ipip daemon is
often a better solution for these environments.
There is very little documentation on the daemon at this time. Look
for the README file in /usr/doc/ipip, and the example config files also
in that tree.
This package was originally written by Mike Westerhof for SunOS. Bdale
Garbee ported it to HP-UX and BSD/OS. Ron Atkinson and John Paul
Morrison then provided the tweaks for Linux.
The package is currently once again being maintained by Bdale Garbee,
both as "upstream maintainer" and as maintainer of the Debian GNU/Linux