netdev - Re: ebtables on a stick

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Message-ID: <4ED90053.4020203@ziu.info>
Date:	Fri, 02 Dec 2011 17:44:03 +0100
From:	Michal Soltys <soltys@....info>
To:	Greg Scott <GregScott@...rasupport.com>
Cc:	David Lamparter <equinox@...c24.net>, netdev@...r.kernel.org
Subject: Re: ebtables on a stick

On 11-12-02 17:20, Greg Scott wrote:
> OK.  But I dunno....  I set eth0 on the router with the same address as
> the real host behind it on eth1.  So something comes in on eth0 for
> 1.2.115.157.  The router has that as its own address now, plus a route
> to somebody else with the same address on eth1.  But as far as the
> router/firewall is concerned, that packet is already delivered - why
> would it forward it out on eth1?
>

Where the packet gets delivered is decided by the routing - and the very 
first table traversed is local - which is auto filled by the kernel. But 
that routing rule still can be forcibly removed, after which the next 
matching one is the one added manually - after which the packet will end 
in FORWARD, instead of INPUT.

(and keep in mind earlier David's warning about confusing 
programs/services - it's still doable, but requires more manual labor - 
proxy is certianly cleaner and just works)

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