From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowmini Varadhan Subject: Re: Q: bad routing table cache entries Date: Tue, 12 Jan 2016 09:47:25 -0500 Message-ID: <20160112144725.GA30240@oracle.com> References: <5682665A.7090102@list.ru> <20151229152208.GA22423@oracle.com> <5695106D.8040909@list.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev , Alexander Duyck To: Stas Sergeev Return-path: Received: from userp1040.oracle.com ([156.151.31.81]:47941 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934724AbcALOre (ORCPT ); Tue, 12 Jan 2016 09:47:34 -0500 Content-Disposition: inline In-Reply-To: <5695106D.8040909@list.ru> Sender: netdev-owner@vger.kernel.org List-ID: On (01/12/16 17:40), Stas Sergeev wrote: > Updated testing results: > After I disabled shared_media not only for "all", but > also for _all_ interfaces individually, the problem seem to > have stopped. So thanks for these hints. > Now, as the media is actually really shared (same NIC/cable), > I just wonder what's going on here. I dont know the history of the shared_media tunable (or the rationale behind the default) - I was just reading out the code - perhaps someone on the list who has the history can share the motivation behind this tunable. > And unfortunately we still don't know why these redirects are > ever accepted... I would guess that it is accepted because there is nothing (no RFC chapter/verse) saying it should not. But the fact remains that the network is sub-optimally configured- each packet that triggers the redirect is now amplified at the router - one copy gets forwarded, and one redirect gets sent back. --Sowmini