netdev - Re: on the the two IPs unreachable if second interface is up

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Message-ID: <4FBFA6B4.6090807@yahoo.co.uk>
Date:	Fri, 25 May 2012 16:35:16 +0100
From:	lejeczek <peljasz@...oo.co.uk>
To:	netdev@...r.kernel.org
Subject: Re: on the the two IPs unreachable if second interface is up

here is something potentially interesting!
when I arping the BOX's public IP from a system/client of 
the private subnet I get replied with a mac of the BOX's 
second(private) interface :-[
could this be normal?

On 25/05/12 16:12, lejeczek wrote:
> hello everybody
>
> apologies if this may feel off the topic, I was hoping 
> some net experts could shed some lights on some peculiar 
> symptoms I experience with one linux box
>
> a BOX has two net interfaces, a public and private one
> public IP is reachable from/via the Internet just fine
> public IP is not reachable from the same private network 
> the BOX's second interface is on
> public IP becomes reachable to private subnet immediately 
> after second(private) interface was turned down
> BOX's firewall whether on or off makes no difference
>
> this is the most peculiar problem of this nature I've ever 
> experienced
>
> the goal is simple, have other systems on the same private 
> subnet as the BOX's second interface to be able to talk to 
> the BOX's public IP
> default gateway for the private subnet is a separate 
> another system.
>
> any suggestions as to how to troubleshoot it I would very! 
> much appreciate
> many thanks!
> -- 
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