From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-2?Q?G=E1sp=E1r_Lajos?= <swifty@freemail.hu>
Subject: Re: ""how can i allow IP protocol 47 "" on iptables to connet a pptp
 VPN server.
Date: Sat, 16 Jun 2007 13:24:44 +0200
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To: "rajeev.sekhar" <rajeev.sekhar@sumasoft.net>
Cc: netfilter@lists.netfilter.org

rajeev.sekhar =EDrta:
> hi list ,
>
> Right now my PPTP VPN server is outside the firewall consuming 2=20
> Static IPaddress,
>
> I want to pleace my PPTP VPN server behind firewall.
>
> i followed good docs on=20
> http://tldp.org/HOWTO/VPN-Masquerade-HOWTO-5.html , but still cant=20
> understand some words in it.
>
> I DNATed 1723, and 500 (which is used for control channels on pptp) to =

> my vpn server behind my firewall.
> The encrypted data channel in PPTP is carried over GRE, IP protocol=20
> 47,  Now how can allow IP protocol 47 from outside , Is this possible? =

> ( pretty new for me)
iptables -p 47 ....
or
iptables -p gre

see /etc/protocols
> They are telling to   ""masquerade ALL protocol traffic"  What they=20
> mean by this?
> I am pasting my firewall rules.
>
>
>
> Is it possible to put vpn server befind firewall?
Maybe... :D
> Is anybody did this before?
I neved did :D


Swifty