[pptp-server] howto access PPTP server behind a NAT server?

[Cowles, Steve]

> -----Original Message-----
> From: Thies C. Arntzen [mailto:thies at thieso.net]
> Sent: Monday, December 24, 2001 2:15 PM
> To: pptp-server at lists.schulte.org
> Subject: [pptp-server] howto access PPTP server behind a NAT server?
> 
> 
>     
>     hi,
>     (please cc:thies at thieso.net)
> 
>     i really hopt this is not a stupid question, i did do a quick
>     google on my problem and haven't found a real answer - so,
>     maybe somebody can help me
> 
>     my "dream" setup:
> 
>       
>     pptp-server     <->     gateway   <-> *internet*  <-> me at home
>     eth0:10.0.0.100)     eth1:10.0.0.1                    eth0:x.y.z.w
>                          eth0:a.b.c.d
> 
>     the gateway runs linux 2.4.9 and does NAT the internal
>     networt to the internet:
>     
>     iptables -t nat -s 10.0.0.0/24 -A POSTROUTING -o eth0 -j 
>     MASQUERADE
> 
>     i now want to forward all incoming pptp traffic from gateway
>     to pptp-server so that me at home is on our internal network
>     after login. i know that i have to forward port 1723 and
>     protocol 43 somehow from gateway to pptp-server but i don't
>     know how? i believe i need something like a reverse NAT from
>     garteway to pptp-server - but i'm kinda clueless where to
>     start.
> 
>     does somebody have an easy-enough solution that he/shw could
>     share with me?
> 
>     regards,
>     tc

Checkout: http://www.impsec.org/linux/masquerade/ip_masq_vpn.html 

Specifically, the 2.4.x series kernel section. The iptable commands you are
seeking are listed there.

Steve Cowles