pptpd problems

Hi @ All,

i successfully set up an pptpd server on my NSLU2 running Openwrt 8.09.2
The NSLU2 is behind a WRT54GL router which is forwarding TCP1723 & GRE47.
Everything is working so far, the clients can successfully logon over the 
internet to the pptpd server -> tunnel is established.
But then the troubles begin. According to 
http://poptop.sourceforge.net/dox/diagnose-forwarding.phtml the problems start 
at test #0
The clients (Windows) are not able to ping the server and vice versa.
I spent a lot of hours of reading differnet articles in the internet but i didnt
find a solution right now.

Here is my config:
NSLU2
Openwrt Kamikaze 8.09.2
pptpd_1.3.0-1_armeb.ipk

Hope someone can help me out with this.

der_Kief

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