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

Hauser Marcel marcel_hauser at gmx.ch
Mon Feb 25 10:46:02 CST 2002


Hehe

Iptables -a output -p 47 -m state --state new -d 172.16.224.30 ..... and
so on !! 

Yes ! I'am allowing it :) ... otherwise the connection from the
172.16.224.0 Network wouln't work :)

Cheers Marcel

-----Original Message-----
From: Hervé Guehl [mailto:herve.guehl at dedigate.com] 
Sent: Monday, February 25, 2002 08:42
To: Hauser Marcel
Subject: RE: [pptp-server] Accessing pptp over a Network behind a
Firewall

Hi .. check if U allow protocol (not port) 47 .. more known as gre :o)

Hervé

> -----Original Message-----
> From: Hauser Marcel [mailto:marcel_hauser at gmx.ch]
> Sent: lundi 25 février 2002 17:20
> To: pptp-server at lists.schulte.org
> Subject: [pptp-server] Accessing pptp over a Network behind a Firewall
> 
> 
> 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 (172.16.224.0), which is my ISP's
> Cable Modem Network. I have an external IP Address lets say
20.20.20.20
> which is mapped to 172.16.224.30. 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 172.16.224.0 Network, and try to
> establish a vpn connection to 172.16.224.30 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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