[pptp-server] Bypassing the firewall

Stan A. Rogge stan at rogge.net
Sat Aug 18 17:41:48 CDT 2001


Isn't the purpose of your company's firewall to prevent exactly what your trying to do?

If you are successful bringing up an external Network link into the middle of your company's internal network, isn't your company's Network Security compromised?

----- Original Message ----- 
From: "Sexy Boy" <Sexy-Boy at NetCourrier.Com>
To: <pptp-server at lists.schulte.org>
Sent: Saturday, August 18, 2001 4:38 PM
Subject: [pptp-server] Bypassing the firewall


> Hi,
> 
> I have a litlle (big for me :-) problem and if some can help me it would be
> cool. So this is my problem :
> 
> At home, i configure a PPTP server on my linux box and it is working fine.
> 
> At my office, i would like to connect my NT 4.0 Workstation to my linux
> server but the problem is the firewall which allows only connection to port
> 21, 25, 80, 110, 443 but not 1723 ! (There is no way to change the firewall
> setting because it's managed by an external company and i can't ask them to
> change anything !)
> 
> So what i'm trying to do is bypass the firewall with port redirection :
> 
> On my NT 4.0       : i redirect local port 1723 to the remote port 443 on my
> linux box
> On my Linux server : i redirect local port  443 to local port 1723
> 
> So if i want to connect to my Linux server on port 1723, i configure the RAS
> to connect to localhost:1723 which is redirect to remote:443 (this bypass
> the firewall) => redirect to linux:1723.
> 
> The redirection is OK because i see the packet to my linux server (with
> tcpdump).
> The problem is that my Linux server considers that a local connection is
> attempted and refuse the connection !!!
> 
> So my question is : Is there a way to allow local connection to a PPTP
> server (local connection = server and client on the same machine like FTP or
> HHTP) ?
> 
> Thanks a lots,
> Francois.
> 
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