[pptp-server] PPTP behind a Firewall

[Robert Dege]

Perhaps someone can help me here.  I am trying (exhaustively) to get my 
PPTP server behind a firewall.  I believe that I almost have it working, 
but one minor thing stands in my way.

I receive this message on the firewall when attempting a PPTP connection:

Apr 16 13:22:47 odo kernel: ip_masq_gre(): creating GRE masq for 
172.28.254.46 -> 12.19.228.58 CID=0 MCID=643A
Apr 16 13:22:47 odo kernel: ip_demasq_gre(): 12.19.228.58 -> 
12.19.228.52 CID=0 no masq table, discarding

For some reason, the MASQID is getting lost between the masqing & 
demasq'ing of the GRE packets.

I am running IPFwd --masq $IP 47
I have John Hardin's PPTP kernel patch running
(both on the firewall).

And I know that the PPTP server works becuase i can successfully connect 
when I remove it from behind the firewall.

Can anybody help me here???


Thanks
-Rob