Thanks for your fast reply, but...
I already read this in your docs and tried it.
Unfortunately the modules depends each other:
Example:

modinfo nf_nat_pptp
-------------------
filename:
/lib/modules/3.5.3-1-ARCH/kernel/net/ipv4/netfilter/nf_nat_pptp.ko.gz
alias:          ip_nat_pptp
description:    Netfilter NAT helper module for PPTP
author:         Harald Welte <[email protected]>
license:        GPL
depends:        nf_conntrack_pptp,nf_nat_proto_gre,nf_nat,nf_conntrack
intree:         Y
vermagic:       3.5.3-1-ARCH SMP preempt mod_unload modversions 686

Blacklisting (all of them?) in "helpers" or "modules.conf will not help I
suppose?

OT: Sorry for the email-formatting, need to figure out which mail-client to
use for the list :(

Tarqi

-----Original Message-----
From: Tom Eastep [mailto:[email protected]] 
Sent: Tuesday, September 18, 2012 10:20 PM
To: Shorewall Users
Subject: Re: [Shorewall-users] GRE blocked on Masq PPTP

On 09/18/2012 12:44 PM, Tarqi Kazan wrote:
> Hi List,
>
> I recently switched to Shorewall, and I it works like a charm (well...
> nearly :)
> However, there is (minor) problem when using a pptp-client behind the 
> firewall.
>
> Based on the two interface example, I like to use a (masq) client to 
> connect to an pptp-server outside:
>
> Client (private net) -> { (private net)  <-FW-> (public net) } -> 
> Internet
> -> PPtP-server
>
> Modules loaded:
>   nf_nat_pptp
>   nf_nat_proto_gre
>   nf_conntrack_pptp
>   nf_conntrack_proto_gre
>

Try unloading the GRE modules. You should only require the pptp modules for
this to work.

-Tom
-- 
Tom Eastep        \ When I die, I want to go like my Grandfather who
Shoreline,         \ died peacefully in his sleep. Not screaming like
Washington, USA     \ all of the passengers in his car
http://shorewall.net \________________________________________________

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Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
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