From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: [Bug 194723] connect() to localhost stalls after 4.9 -> 4.10 upgrade Date: Thu, 16 Mar 2017 09:27:17 -0700 Message-ID: <20170316092717.30b605aa@xeon-e3> References: <20170315133619.64a31120@xeon-e3> <1489614034.28631.162.camel@edumazet-glaptop3.roam.corp.google.com> <20170315.153017.1728029219325534654.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: eric.dumazet@gmail.com, netdev@vger.kernel.org To: David Miller Return-path: Received: from mail-pf0-f169.google.com ([209.85.192.169]:35659 "EHLO mail-pf0-f169.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752181AbdCPQ10 (ORCPT ); Thu, 16 Mar 2017 12:27:26 -0400 Received: by mail-pf0-f169.google.com with SMTP id x63so21245275pfx.2 for ; Thu, 16 Mar 2017 09:27:25 -0700 (PDT) In-Reply-To: <20170315.153017.1728029219325534654.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, 15 Mar 2017 15:30:17 -0700 (PDT) David Miller wrote: > From: Eric Dumazet > Date: Wed, 15 Mar 2017 14:40:34 -0700 > > > Finally time to get rid of buggy tw_recycle, that apparently some > > distros set to one. > > It's not buggy, it's just not designed in a way that it can work in > the presence of NAT. > > So yes, indeed, NO DISTRO SHOULD CHANGE THE VALUE TO "1" by default. > > Is CentOS the only culprit? > > But removing it is unnecessary, people who know what they are doing > can legitimately enable it if they know that there is no NAT going > on in their paths. The bug was reported first on CentOs but the bugzilla entry mentions the same problem exists on Arch Linux. Ubuntu (and Debian) do not have the problem. RHEL 7 also ok. https://bugzilla.kernel.org/show_bug.cgi?id=194723