From: Tom Eastep <teastep@shorewall.net>
To: Derek Vincent <derek.vincent@kemikal.net>, netfilter@lists.netfilter.org
Subject: Re: NATing PPTP GRE traffic
Date: Tue, 20 Jan 2004 06:47:33 -0800 [thread overview]
Message-ID: <200401200647.33819.teastep@shorewall.net> (raw)
In-Reply-To: <00b901c3df5f$52597f30$686fa8c0@vincent>
On Tuesday 20 January 2004 06:11 am, Derek Vincent wrote:
> I have been try to setup a firewall that will pass PPTP/L2TP traffic to a
> windows 2003 server inside the network...
>
> I am using Mandrake 9.2 with the 2.4.22-10mdksecure (delivered) kernel.
>
> I believe that I have shorewall configured correctly rules below:
>
> DNAT:info net loc:192.168.105.1 tcp 1701 -
> DNAT:info net loc:192.168.105.1 udp 1701 -
> DNAT:info net loc:192.168.105.1 tcp 1723 -
> DNAT:info net loc:192.168.105.1 47 - -
>
> and I am loading the following netfilter modules for natting pptp:
>
> ip_nat_pptp
> ip_conntrack_pptp
> ip_nat_proto_gre
> ip_conntrack_proto_gre
>
> The issue I am having is the when I try to VPN in to the nated windows
> server things seem to go ok for the initial communication but I get the
> error below:
>
> protocol 47 unreachable [tos 0xc0]
>
> After this occurs a half dozen times the vpn client errors out.
>
> I had found a googled message regarding something similar with the 2.4.22
> kernel and tried to the patch-o-matic on it and I suspect that the mandrake
> 2.4.2-10mdk already has this issue patched since I did not see any patches
> that discussed this issue...
>
> I was wondering if there is anything I have missed in the FW rules or if I
> am missing load a module...
You should probably post questions of this sort on the Shorewall list rather
than on this list. If you chose to have Mandrake configure Shorewall for you,
the 'loc' zone is empty and the zone for the local network is called 'masq'.
The rules you need to forward PPTP traffic to the server are thus:
DNAT net masq:192.168.105.1 tcp 1723
DNAT net masq:192.168.105.1 47
-Tom
--
Tom Eastep \ Nothing is foolproof to a sufficiently talented fool
Shoreline, \ http://shorewall.net
Washington USA \ teastep@shorewall.net
next prev parent reply other threads:[~2004-01-20 14:47 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-20 14:11 NATing PPTP GRE traffic Derek Vincent
2004-01-20 14:37 ` Philipp Stader
2004-01-20 14:47 ` Tom Eastep [this message]
[not found] <20040120143327.32258.qmail@e-xyn.com>
2004-01-20 14:37 ` Derek Vincent
2004-01-20 14:59 ` Antony Stone
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