From: Brian Haley <brian.haley@hp.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: netdev@vger.kernel.org, Mahesh Kelkar <maheshkelkar@gmail.com>,
Lorenzo Colitti <lorenzo@google.com>,
Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: echo > 0 .../disable_ipv6 broken in 2.6.37-rc4
Date: Wed, 08 Dec 2010 17:49:17 -0500 [thread overview]
Message-ID: <4D000B6D.1060708@hp.com> (raw)
In-Reply-To: <m14oaoeywf.fsf@fess.ebiederm.org>
On 12/08/2010 04:29 PM, Eric W. Biederman wrote:
> Brian Haley <brian.haley@hp.com> writes:
>
>> 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
<snip>
>> I'm pulling the latest tree now, my 2.6.32.24 system is running fine, so
>> it's something after that.
>
> Agreed. I don't have problems on 2.6.33 either, but because of overload
> I haven't been doing regular testing of the kernels inbetween.
This got broken in 2.6.34-rc1, and the most obvious culprit is this,
although I haven't bisected it:
commit dc2b99f71ef477a31020511876ab4403fb7c4420
Author: stephen hemminger <shemminger@vyatta.com>
Date: Mon Feb 8 19:48:05 2010 +0000
IPv6: keep permanent addresses on admin down
Permanent IPV6 addresses should not be removed when the link is
set to admin down, only when device is removed.
When link is lost permanent addresses should be marked as tentative
so that when link comes back they are subject to duplicate address
detection (if DAD was enabled for that address).
Other routing systems keep manually configured IPv6 addresses
when link is set down.
Even though there was a bugfix update, it didn't help.
I unfortunately won't be able to look at this more until at least Friday,
I couldn't come up with a quick patch just looking quickly at addrconf_ifdown().
-Brian
next prev parent reply other threads:[~2010-12-08 22:49 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-06 0:24 echo > 0 .../disable_ipv6 broken in 2.6.37-rc4 Eric W. Biederman
2010-12-06 0:33 ` Lorenzo Colitti
2010-12-06 0:39 ` Eric W. Biederman
2010-12-06 5:51 ` Eric W. Biederman
2010-12-06 16:10 ` Brian Haley
2010-12-08 21:29 ` Eric W. Biederman
2010-12-08 22:49 ` Brian Haley [this message]
2010-12-08 23:13 ` Eric W. Biederman
2010-12-08 23:49 ` Stephen Hemminger
2010-12-09 2:42 ` Eric W. Biederman
2010-12-09 3:18 ` Eric W. Biederman
2010-12-09 4:16 ` [PATCH] Fix 2.6.34-rc1 regression in disable_ipv6 support Eric W. Biederman
2010-12-09 15:28 ` Brian Haley
2010-12-09 16:27 ` Stephen Hemminger
2010-12-09 19:22 ` Eric W. Biederman
2010-12-09 19:09 ` Eric W. Biederman
2010-12-09 19:16 ` Stephen Hemminger
2010-12-09 19:31 ` Eric W. Biederman
2010-12-09 20:20 ` David Miller
2010-12-09 20:20 ` David Miller
2010-12-09 22:51 ` Stephen Hemminger
2010-12-16 21:28 ` [RFC] ipv6: don't flush routes when setting loopback down Stephen Hemminger
2010-12-16 23:17 ` Eric W. Biederman
2010-12-17 1:18 ` Eric W. Biederman
2010-12-17 2:26 ` David Miller
2011-01-19 19:18 ` Jiri Bohac
2011-01-19 19:38 ` Stephen Hemminger
2011-01-19 19:56 ` Jiri Bohac
2011-01-19 20:01 ` Stephen Hemminger
2011-01-22 8:17 ` Eric W. Biederman
2011-01-22 22:39 ` Stephen Hemminger
2011-01-22 22:54 ` David Miller
2011-01-23 4:41 ` Stephen Hemminger
2011-01-23 5:42 ` David Miller
2011-01-23 8:24 ` Stephen Hemminger
2011-01-23 8:26 ` Stephen Hemminger
2011-01-23 9:15 ` [stable] " Willy Tarreau
2011-01-23 9:21 ` Stephen Hemminger
2011-01-23 10:34 ` Stephen Hemminger
2011-01-23 19:21 ` Eric W. Biederman
2011-01-23 19:57 ` [stable] " David Miller
2011-01-23 19:48 ` David Miller
2011-01-23 19:47 ` David Miller
2010-12-10 4:02 ` [PATCH] Fix 2.6.34-rc1 regression in disable_ipv6 support Stephen Hemminger
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