netdev - Re: recommended way to support duplicate IP addresses on different VLANs?

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Message-ID: <4E1B1D16.7060803@candelatech.com>
Date:	Mon, 11 Jul 2011 08:56:06 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Chris Friesen <chris.friesen@...band.com>
CC:	Rémi Denis-Courmont <remi@...lab.net>,
	Chris Friesen <cbf123@...l.usask.ca>, netdev@...r.kernel.org
Subject: Re: recommended way to support duplicate IP addresses on different
 VLANs?

On 07/11/2011 08:48 AM, Chris Friesen wrote:
> On 07/11/2011 09:04 AM, Rémi Denis-Courmont wrote:
>> Le lundi 11 juillet 2011 17:58:14 Chris Friesen, vous avez écrit :
>>> Hi all,
>>>
>>> We've got a server that sits on multiple VLANs. Each VLAN is segregated
>>> and doesn't know about the others. The IP address ranges in each of the
>>> VLANs may overlap, and the server may be assigned the same IP address in
>>> multiple VLANs.
>
>>> Is there any other way to deal with this scenario?
>
>
>> Or then binding sockets to devices (SO_BINDTODEVICE) might work.
>
> Hmm...SO_BINDTODEVICE looks interesting. I would imagine we'd still need
> to do some funky stuff around ARP handling.

arp_filter should help.

Also, you may want to use conn-trck tables.  This lets packets coming
in one or more interfaces use a specific conn-track cache.  Might help
keep the identical IPs from colliding in their conn tracking.

iptables -t raw -A PREROUTING -i eth0.7 -j CT --zone 7

Thanks,
Ben

>
> Chris
>
>
>


-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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