[Openswan Users] still mtu troubles

jef peeraer jef.peeraer at pandora.be
Mon Mar 7 20:41:59 CET 2005

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....

> Just a thought.
> -Rolf

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