[Openswan Users] MTU problems - Openswan to freeswan

Paul Wouters paul at xelerance.com
Mon May 29 12:01:51 CEST 2006

On Sun, 28 May 2006, Cameron Davidson wrote:

> > I suppose I could use the overridemtu option, without actually losing any
> > capacity, but I don't understand why it is getting it wrong.
> > ...
> No, I can't. "Not supported with NETKEY."
> The man page for "ip" sort of suggests you can set mtu per route, but I can't
> work out how.

ip route add a.b.c.d via e.f.g.h mtu xxxx

An easier method is setting the external interface's mtu to a lower value, so that
path mtu discovery might pick it up correctly. If that does not help, lower the
mtu on the *other* end's public interface.


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