secnet - 0.6.7 main

secnet allows multiple private networks, each 'hidden' behind a single
globally-routable IP address, to be bridged together. It also
supports individual client systems which may connect to multiple
upstreams.
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Compared to many other systems, secnet has good handling of mobile
endpoints (mobile client nodes), and extremely flexible configuration.
However, it is not easy to configure.
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secnet works well with userv-ipif (allowing it to run without needing
root privilege) and hippotat (not currently in Debian).
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secnet is the main VPN program used by greenend.org.uk.