[Openswan Users] Phase 1 hangs (resolved)

Erich Titl erich.titl at think.ch
Fri Aug 20 19:42:41 EDT 2010

For anyone interested, changing the DSL modem on the remote side solved
the problem.

Thanks to all that shared their experience


on 13.08.2010 15:45, Michael Smith wrote:
> Erich Titl wrote:
>> Looking at the packets on the central host, it is obvious that the
>> fragmented packet from one site gets reassembled whereas the one from
>> the failing site does not even arrive. It looks like someone in the
>> middle drops the second packet.
> I've seen ISPs do terrible things with large UDP packets. One of them
> even cut the last 8 bytes off the first fragment.
> How much control do you have over the client? You could drop the MTU on
> the interface, or add an override route:
> ip route add <central host> via <client's def gw> mtu 1300 advmss 1260
> Mike

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