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From: Florian Westphal <fw@strlen.de>
To: Marcin Kabiesz <marcin.kabiesz@smarthost.pl>
Cc: Florian Westphal <fw@strlen.de>, netfilter@vger.kernel.org
Subject: Re: NAT translation problem - leakage of packets with original source address
Date: Fri, 11 Mar 2022 13:53:26 +0100	[thread overview]
Message-ID: <20220311125326.GA10646@breakpoint.cc> (raw)
In-Reply-To: <039c7dc8fed7947df5a7e72ead9a9627@smarthost.pl>

Marcin Kabiesz <marcin.kabiesz@smarthost.pl> wrote:
> Chain POSTROUTING (policy ACCEPT 1170K packets, 1616M bytes)
>  pkts bytes target     prot opt in     out     source
> destination
> 84216 8212K ACCEPT     all  --  *      eth0.2  192.168.10.0/24
> 0.0.0.0/0
>  552K   46M ACCEPT     all  --  *      eth0.2  192.168.11.0/24
> 0.0.0.0/0
>     0     0 ACCEPT     all  --  *      eth0.2  192.168.12.0/24
> 0.0.0.0/0
>     0     0 DROP       all  --  *      eth0.2  192.168.0.0/16
> 0.0.0.0/0
>     0     0 DROP       tcp  --  *      eth0.2  0.0.0.0/0
> 0.0.0.0/0            state INVALID

I suspect you need to move the INVALID rule to the beginning,
else packets might get accepted by earlier rule.


  reply	other threads:[~2022-03-11 12:53 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-10 11:40 NAT translation problem - leakage of packets with original source address Marcin Kabiesz
2022-03-10 12:08 ` Florian Westphal
2022-03-10 12:33   ` Marcin Kabiesz
2022-03-10 14:53     ` Florian Westphal
2022-03-11  9:11       ` Marcin Kabiesz
2022-03-11 12:53         ` Florian Westphal [this message]
2022-03-11 13:45           ` Marcin Kabiesz

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