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The FreeSWAN team is debugging some problems with generation of
ICMP fragment needed packets.
We observe the packets going out, but under some network
conditions that we are involved in, they do not reach the destination.
In particular, when we generate them addressed to the host that
we are on, we can't tcpdump eth0, ipsec0 or lo to see them.
So, we are wondering how to determine what the cached PMTU to
a particular destination is?
We think that /proc/net/rt_cache might have info, but we don't
see it. Is there another place that we should look?
(BSD systems with PMTU put this into the routing table, so
one can see this with netstat -rn.)
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Comment: Finger me for keys
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