IPSec with AVM Fritz!Box

Hey there,

I am currently trying to setup a IPSec connection between an AVM 
Fritz!Box (router) and my m0n0wall. I'm using the tunneling method. I 
know the correct settings on both ends for establishing the link.
Also the link is being established fine. However I cannot get a 
connection to any PC on m0n0wall's site. I cannot even connect to the 
configpage of m0n0wall located at 192.168.1.1.

Basically I followed this tutorial 
http://hansmi.ch/articles/fritzbox-m0n0wall-vpn

I had a look at the status page of m0n0wall and have seen that the 
packets via ESP are dropped because of "no TDB". So I allowed fragmented 
packets for IPSec and checked for unblocking the private networks in WAN 
config as mentioned here: 
http://forum.m0n0.ch/index.php/topic,6082.msg18967.html#msg18967
But it didn't help.

I'm stuck on this. As usual any help is appreciated.

Regards

Joschka

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