[Openswan Users] l2tp/ipsec problem

[Norbert Wegener]

We get some userfeedback stating, that they can connect to an openswan 
gateway via their dsl-router, when they use a cable.
Their session to the same gateway does not come up, when they connect 
wireless via the same dsl router to the same gaeway using the same 
(xp,sp2) client.
As those users are far away, there is no chance to have a look at their 
environment.
What could be a way to track such a problem down, or is this a known 
problem with a known solution?
All connections are authenticated via certificates.
Thanks
Norbert