[pptp-server] Accessing pptp over a Network behind a Firewall

Hauser Marcel marcel_hauser at gmx.ch
Mon Feb 25 10:19:52 CST 2002

Hi All

Hope this is not in any FAQ I din't read :) .... 

I'am new to this list... and I've currently successfully installed pptp
+ ppp on my Firewall which is based on RH 7.2.

Let me outline the Problem:
My Firewall is in a private network (, which is my ISP's
Cable Modem Network. I have an external IP Address lets say
which is mapped to At my Firewall I'am allowing port 1723
and Protocol 47 as explained in many FAQ's and HOWTO's.
If I put a winXP Notebook into the Network, and try to
establish a vpn connection to everthing is working just
fine !
BUT !! I can't connect from everywhere else on the internet.
I know it looks like a firewall issue... but that thing doing NAT at my
ISP isn't a firewall... it just does nat (allowing every kind of
traffic) !! 
The places where I try to connect to my firewall do have firewall's
aswell... but I know for sure, that they are allowing everything from
inside to outside !!

I know that IPSEC will not work in NAT Situations... but pptp isn't
using IPSEC.... what could be the problem here ??

In the logfiles I get

Sent [LCP ConfReq id=0x1 <mru 1490> <asyncmap 0x0> <auth chap 81> <magic
0x4328jfaal> <pcomp> <accomp>
Last message repeated 9 times
LCP: timeout sending Config-Requests
Connection terminated !

Any help would be very appreciated :)

Thanks in advance

Cheers Marcel

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