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From: Chris Meidinger <cmeidinger@sendmail.com> To: "Patrick W. Gilmore" <patrick@ianai.net>, Mikael Abrahamsson <swmike@swm.pp.se> In-Reply-To: <4183F952-A7B3-41E3-9C6B-FDB8245B301F@ianai.net> Date: Mon, 11 May 2009 22:45:53 +0200 Cc: NANOG list <nanog@nanog.org> Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org On 11.05.2009, at 22:34, Patrick W. Gilmore wrote: > On May 11, 2009, at 4:29 PM, Chris Meidinger wrote: > >> I would be grateful for a pointer to such an RFC statement, >> assuming it exists. > > Why would an RFC prohibit this? > > Most _implementations_ do, but as far as network "rules" in general > it is a valid configuration. That was essentially my conclusion as well: logically it can't work, but I wasn't certain where it might be forbidden. Thusly did I come to NANOG with the question, thinking smarter people than I might know. If it's completely down to implementation, or really to the interaction between TCP and underlying IP, then so be it. I was hoping that I might just not have thought of the right place to look. On 11.05.2009, at 22:39, Mikael Abrahamsson wrote: > 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 this. Yes, I've gotten it to work as well as little as 10 days ago, but it's not something that $random_customer should be doing as a matter of practice. Thus, again, my hope that I just wasn't thinking of the right place to look to find an IETF recommendation against doing so. Thanks for the input! Chris
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