> > > Today a new site joined our Linux IPSec VPN, now all the 
> > other routers
> > > (all 2.6.22) freeze hard reproducible.

The problem is more general und ugly than I thought.

I took 2 arbitrary boxes, one behind an Ethernet (A, Kernel 2.6.21, MTU
1500), one behind ADSL (B, 2.4.x, 1492).
Established a tunnel, copied a file from site A to B through the tunnel
and router A died in the same moment.

Out of my feeling this worked fine some kernel releases earlier.

As written in this thread before, I see an external need-to-frag-ICMP,
no tunnel need-to-frag will be thrown, box freezes.

You should be able to reproduce it with any network path with a smaller
MTU?!?

Daniel
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