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From: Thomas Graf <tgraf@suug.ch>
To: Olaf Kirch <okir@suse.de>
Cc: netdev@vger.kernel.org, Jan Beulich <jbeulich@suse.de>
Subject: Re: [RFC IPv6] Disabling IPv6 autoconf
Date: Tue, 29 Aug 2006 20:10:21 +0200	[thread overview]
Message-ID: <20060829181021.GA3470@postel.suug.ch> (raw)
In-Reply-To: <20060829082435.GA2676@suse.de>

* Olaf Kirch <okir@suse.de> 2006-08-29 10:24
> we had bug reports from people seeing lots of spurious messages
> like the following:
> 
> kernel: peth0: received packet with own address as source address.
> 
> and
> 
> xenbr0: duplicate address detected!
> 
> This is on a Xen enabled machine, with lots of Xen machines on the
> same network.
> 
> When the Xen code configures the bridge device, this will do IPv6
> autoconfiguration for the interface, and since they use synthetic MAC
> addresses, there will be DAD collisions.
> 
> When the Xen people looked for a way to disable IPv6 autoconf of the
> bridge, they didn't find any way to do it without bringing up the
> device first (and thereby triggering DAD).

They didn't find any because there is no need to disable it. I
hardly think that the network stack should fix things that Xen
got wrong. Setting dev_addr to -1 is just plain wrong, other
virtual ethernet devices call random_ether_addr(), it's not a
new problem at all.

  parent reply	other threads:[~2006-08-29 18:10 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-08-29  8:24 [RFC IPv6] Disabling IPv6 autoconf Olaf Kirch
2006-08-29  9:34 ` YOSHIFUJI Hideaki / 吉藤英明
2006-08-29  9:54   ` David Miller
2006-08-29 10:39     ` Herbert Xu
2006-08-29 10:45       ` Olaf Kirch
2006-08-29 10:55     ` Pekka Savola
2006-08-29 11:10       ` Olaf Kirch
2006-08-29 11:13       ` Peter Bieringer
2006-08-29 16:30     ` Alexey Kuznetsov
2006-08-29 10:44   ` Olaf Kirch
2006-08-29 15:51     ` Stephen Hemminger
2006-08-29 11:21 ` Hasso Tepper
2006-08-29 11:31   ` Peter Bieringer
2006-08-29 13:04     ` Herbert Xu
2006-08-29 13:59       ` Hasso Tepper
2006-08-30  0:12         ` Herbert Xu
2006-08-30  3:26           ` YOSHIFUJI Hideaki / 吉藤英明
2006-08-30  5:41           ` Hasso Tepper
2006-08-29 18:10 ` Thomas Graf [this message]
2006-08-29 20:00   ` Olaf Kirch

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