From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chuck Lever Subject: TCP over lo Date: Mon, 03 May 2010 16:00:48 -0400 Message-ID: <4BDF2B70.2040301@oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from rcsinet10.oracle.com ([148.87.113.121]:49072 "EHLO rcsinet10.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756381Ab0ECUA7 (ORCPT ); Mon, 3 May 2010 16:00:59 -0400 Received: from rcsinet13.oracle.com (rcsinet13.oracle.com [148.87.113.125]) by rcsinet10.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o43K0uo7000640 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 3 May 2010 20:00:57 GMT Received: from acsmt354.oracle.com (acsmt354.oracle.com [141.146.40.154]) by rcsinet13.oracle.com (Switch-3.4.2/Switch-3.4.1) with ESMTP id o430kF8o005255 for ; Mon, 3 May 2010 20:00:55 GMT Sender: netdev-owner@vger.kernel.org List-ID: I've got a bug report about attempting to mount a remote NFSv4 server while the client's lo interface is down. Apparently a TCP connection attempt over lo when it is DOWN results in ETIMEDOUT. If I attempt a TCP connect on eth0 when it is DOWN I get ENETUNREACH. Is this behavior difference by design? Is there some other information I'm missing? Just wondering how to go about addressing the issue. Thanks in advance for advice. -- chuck[dot]lever[at]oracle[dot]com