From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vlad Yasevich Subject: Re: Configuring the same IP on multiple addresses Date: Mon, 29 Oct 2007 15:44:26 -0400 Message-ID: <4726381A.6050002@hp.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev To: David Stevens Return-path: Received: from atlrel7.hp.com ([156.153.255.213]:39675 "EHLO atlrel7.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756081AbXJ2Tox (ORCPT ); Mon, 29 Oct 2007 15:44:53 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org David Stevens wrote: > netdev-owner@vger.kernel.org wrote on 10/29/2007 11:03:37 AM: > >> So, I am looking for technical reasons why this is permitted. > > Vlad, > Is there a technical reason to disallow it? Rather than > anticipate all the possible uses for a machine, it's, of course, > generally better to restrict only the things you know can't > work, and allow everything else. > > +-DLS For v4, not really, but it really confuses some people (and thus causes me headaches ;-) For v6, there are plenty of operational reasons to not allow this. You really turn unicast into anycast when you do this and there are special rules to be followed. -vlad