[114434] in North American Network Operators' Group

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Re: two interfaces one subnet

daemon@ATHENA.MIT.EDU (Chris Meidinger)
Mon May 11 17:25:20 2009

From: Chris Meidinger <cmeidinger@sendmail.com>
To: "Alex H. Ryu" <r.hyunseog@ieee.org>
In-Reply-To: <4A08967C.7010901@ieee.org>
Date: Mon, 11 May 2009 23:23:11 +0200
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org

On 11.05.2009, at 23:19, Alex H. Ryu wrote:

> Unless you configure Layer 2 for two interfaces, it's not going to  
> work.
> It is invalid from networking principle.
> If you have to send the traffic for host in same subnet you  
> configured,
> which interface it should send out ?
> Basically it may create broadcast storm loop by putting two ip  
> addresses
> in same subnet in different interface.
> It may be allowed from host-level, but from router equipment, I don't
> think it was allowed at all.

Alex, I _personally_ know that it's a problem. I was hoping for an RFC- 
reference, or similar standards document, to show to customers to  
convince them to stop trying to hack things to make it work.

Chris


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