From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Haley Subject: Re: echo > 0 .../disable_ipv6 broken in 2.6.37-rc4 Date: Mon, 06 Dec 2010 11:10:24 -0500 Message-ID: <4CFD0AF0.9090809@hp.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, Mahesh Kelkar , Lorenzo Colitti To: "Eric W. Biederman" Return-path: Received: from g5t0008.atlanta.hp.com ([15.192.0.45]:4499 "EHLO g5t0008.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751120Ab0LFQK1 (ORCPT ); Mon, 6 Dec 2010 11:10:27 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: On 12/05/2010 07:24 PM, Eric W. Biederman wrote: > > In 2.6.37-rc4 ipv6 can be disabled not enabled. > The last kernel I have tested and know this works on is 2.6.33. > > To reproduce: > ~ # ip link set lo up > ~ # ping6 ::1 > PING ::1(::1) 56 data bytes > 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.026 ms > ^C > --- ::1 ping statistics --- > 1 packets transmitted, 1 received, 0% packet loss, time 782ms > rtt min/avg/max/mdev = 0.026/0.026/0.026/0.000 ms > ~ # echo 1 > /proc/sys/net/ipv6/conf/lo/disable_ipv6 > ~ # ping6 ::1 > connect: Network is unreachable > ~ # echo 0 > /proc/sys/net/ipv6/conf/lo/disable_ipv6 > ~ # ping6 ::1 > connect: Network is unreachable > > > I intend to poke at this a little more but at the moment > I am drawing a blank at what is going on. It should just be calling addrconf_notify() with either NETDEV_UP or NETDEV_DOWN. Does the address not come back? Or the route? > I intend to keep poking at this but if anyone can figure this out > before I do I would be greatly appreciative. I'm pulling the latest tree now, my 2.6.32.24 system is running fine, so it's something after that. -Brian