From: Mart Frauenlob <mart.frauenlob@chello.at>
To: netfilter@vger.kernel.org
Subject: Re: MASQUERADE and ACCEPT targets
Date: Wed, 24 Feb 2010 15:57:45 +0100 [thread overview]
Message-ID: <4B853E69.9040402@chello.at> (raw)
In-Reply-To: <cfeab66d1002240645i632227ccpbe8f3e55cebaf947@mail.gmail.com>
On 24.02.2010 15:45, netfilter-owner@vger.kernel.org wrote:
> All ,
>
> R1) iptables -t nat -I POSTROUTING -o eth0 -m state --state
> ESTABLISHED,RELATED -j ACCEPT
> R2) iptables -t nat -A POSTROUTING -o eth0 -j MASQERADE
>
>
> machine "B"
> ------------------------------------------
> | |
> | |
> machine "A" ------> eth0 |
> |eth1----------------------------------------> internet
> | |
> | |
> ------------------------------------------
>
> I applied rules R2 and i am able to browse internet from machine A .
>
> 1. Is there any problem if i apply R1 ?
> 2. if packet state become ESTABLISHED ( not a new packet ) , do we
> need MASQERADE target for remaing packets ???
>
> Thanks,
> Ratheesh
The nat table only sees state NEW packets.
A rule with state "ESTABLISHED,RELATED" will never match there.
iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE is good (without
the typo).
Do filtering (ACCEPT/DROP/REJECT) in the filter table.
iptables -A FORWARD -o eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT
same for OUTPUT maybe.
Best regards
Mart
next prev parent reply other threads:[~2010-02-24 14:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-24 14:45 MASQUERADE and ACCEPT targets ratheesh k
2010-02-24 14:57 ` Mart Frauenlob [this message]
2010-02-25 4:01 ` ratheesh k
2010-02-25 9:59 ` Mart Frauenlob
2010-02-25 12:36 ` ratheesh k
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