two interfaces one subnet

Mikael Abrahamsson swmike at
Mon May 11 15:39:08 CDT 2009

On Mon, 11 May 2009, Chris Meidinger wrote:

> 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.

I don't know if it still works, but it did in Linux little over 10 years 
back. Proxy-arp:ed all the IPs in the /27 in the /24 and everything was 
fine (legacy reasons plus radiolink which I didn't want to run a lot of 
broadcasts over). There are "legitimate" cases where you might want to do 

Mikael Abrahamsson    email: swmike at

More information about the NANOG mailing list