[Openswan Users] still mtu troubles

[Rolf Offermanns]

On Monday 07 March 2005 20:41, jef peeraer wrote:
> On maandag 07 maart 2005 09:22, you wrote:
> > On Sunday 06 March 2005 15:50, jef peeraer wrote:
> > > i had a roadwarrior ( isdn adsl ), which seemed to freezed once in a
> > > while, clearly an mtu problem. set the mtu to 1400, and it seemed to
> > > work. until the users wanted to send attachements with their mails.
> > > after a 7 % of transmission , the connection seemed to stall. smtp is
> > > tcp, so it can't be a problem concerning this udp fragmentation. what
> > > else could i try  ?
> >
> > Do you use NAT-T. If you do, then udp is back in the calculation, since
> > the esp packets are wrapped in udp again.
>
> no, i am not using nat-t. another strange thing is that i am using the same
> setup with 10 other roadwarriors, but they are adsl over pstn. they don't
> have any problem at all. so it must be something which relates to this isdn
> configuration in the router....

Can you do a tcpdump and see what is going on?
-Rolf

-- 
Rolf Offermanns <roffermanns at sysgo.com>
SYSGO AG     Tel.: +49-6136-9948-0
Am Pfaffenstein 14   Fax: +49-6136-9948-10
55270 Klein-Winternheim  http://www.sysgo.com