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From: "curby ." <curby.public@gmail.com>
To: "Ricardo J. Méndez" <mendezster@gmail.com>
Cc: netfilter@lists.netfilter.org
Subject: Re: IP forwarding
Date: Thu, 4 Aug 2005 15:33:36 -0600	[thread overview]
Message-ID: <5d2f3791050804143370a332d8@mail.gmail.com> (raw)
In-Reply-To: <286cf082050804114220fcca1f@mail.gmail.com>

On 8/4/05, Ricardo J. Méndez <mendezster@gmail.com> wrote:
> But I 'm testing this from a desktop on the network, not the firewall
> itself. PREROUTING should apply to those packets, correct?

In that case, the problem you're seeing is exactly that which is
discussed in the HOWTO link I posted last time.  It's also explained
by Jason's link.  The idea is that packets TO the server are indeed
being correctly mangled by the router, but return packets go directly
from server to client.  The client expects the reply from the router,
sees some spurious traffic from the server, and drops the traffic.

The netfilter list sees some variation of this question once every
week or so.  You're definitely not alone. =)

Another attempt to explain it:
https://lists.netfilter.org/pipermail/netfilter/2005-July/061636.html


  reply	other threads:[~2005-08-04 21:33 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-08-04  1:37 IP forwarding Ricardo J. Méndez
2005-08-04  4:15 ` Gömöri Zoltán
2005-08-04  5:02   ` curby .
2005-08-04 18:42     ` Ricardo J. Méndez
2005-08-04 21:33       ` curby . [this message]
2005-08-04 22:20         ` Ricardo J. Méndez
2005-08-04  7:55   ` Jan Engelhardt
2005-08-04 16:22 ` Patrick Nelson
2005-08-04 18:19   ` Ricardo J. Méndez
2005-08-04 19:54     ` Patrick Nelson
2005-08-04 19:33 ` Jason Opperisano
  -- strict thread matches above, loose matches on Subject: below --
2012-01-27  9:59 Prashant Batra (prbatra)
2005-10-21 21:22 IP Forwarding Jerry Alexander
2005-10-22 12:53 ` Henrik Nordstrom
2005-10-22 13:11 ` Aseem Rastogi
     [not found] <20041028172521.3B3CB672@mail.817west.com>
2004-10-28 18:26 ` Ip Forwarding Jason Opperisano
2004-10-30 10:55   ` Nick Drage
2004-10-30 15:25     ` Jason Opperisano
2004-10-30 17:29       ` Nick Drage
2004-10-28 17:23 Joe Wright
2003-02-21 23:46 William Olbrys
2003-02-22  0:28 ` Willi Dyck
2003-02-22  0:47   ` William Olbrys
2003-02-22 14:57     ` William Olbrys
2003-02-23  3:43       ` Bjorn Ruberg
2003-02-23 21:38         ` Willi Dyck
2002-09-28  4:22 IP forwarding SB CH
2002-09-28  7:27 ` Antony Stone

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