[114436] in North American Network Operators' Group
Re: two interfaces one subnet
daemon@ATHENA.MIT.EDU (Dan White)
Mon May 11 17:31:42 2009
Date: Mon, 11 May 2009 16:31:31 -0500
From: Dan White <dwhite@olp.net>
To: Chris Meidinger <cmeidinger@sendmail.com>
In-Reply-To: <4B3726C0-20FE-4598-B4DA-44FA74FDFC71@sendmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Chris Meidinger wrote:
> Hi,
>
> This is a pretty moronic question, but I've been searching RFC's
> on-and-off for a couple of weeks and can't find an answer. So I'm
> hoping someone here will know it offhand.
> I've been looking through RFC's trying to find a clear statement that
> having two interfaces in the same subnet does not work, but can't find
> it that statement anywhere.
> The OS in this case is Linux. I know it can be done with clever
> routing and prioritization and such, but this has to do with vanilla
> config, just setting up two interfaces in one network.
> I would be grateful for a pointer to such an RFC statement, assuming
> it exists.
If your goal is to achieve redundancy or to increase bandwidth, you can
bond the interfaces together - assuming that you have a switch / switch
stack that supports 802.3ad.
Then you could assign multiple IPs to the bonded interface without any
layer 3 messyness.
- Dan
