I remember this kind of problem with very old kernels. The simplest workaround was to ping6 something every 5 minutes.
Fabio On Wed, 21 Jan 2004, James H. Cloos Jr. wrote: > Has anyone else been having problems with tunnels to brokers? > > I've two uml boxen (slices?) running sid (though this also happened > with stable and testing) whose tunnels would stop working after some > undetermined-by-me uptime. > > A packet trace on eth0 would show the packets coming in but they > never made the jump to the sit interface. > > This happened with tunnels from both he and bt. > > What I cannot tell is whether it is a uml bug, general 2.4 kernel bug > or something deb specific.... > > Is this a common problem? > > -JimC > > > -- Our mission: make IPv6 the default IP protocol "We are on a mission from God" - Elwood Blues http://www.itojun.org/paper/itojun-nanog-200210-ipv6isp/mgp00004.html
