[Users] Re: network problems: eth0: received packet with
frank at si.ct.upc.edu
Mon May 24 05:41:34 EDT 2010
Thanks a lot for you explanation Benoit
I hope OpenVZ developers will take this in account.
Al 21/05/10 18:00, En/na users-request at openvz.org ha escrit:
> Date: Fri, 21 May 2010 17:56:52 +0200 From: Benoit Branciard
> <Benoit.Branciard at univ-paris1.fr> Subject: Re: [Users] Re: network
> problems: eth0: received packet with own SOLVED and POSSIBLE BUG
> *WARNING*) To: users at openvz.org Message-ID:
> <4BF6AD44.8030907 at univ-paris1.fr> Content-Type: text/plain;
> charset=ISO-8859-1; format=flowed frank a écrit :
>> > Hi,
>> > after a lot of tests I looked at a Xen machine, which also use ethernet
>> > bridges and veths, and I noticed that it always use MAC
>> > address FE:FF:FF:FF:FF:FF for the veths. I have test it on VE's
>> > and...voila! No more mess with the MACs! Now the MAC of the ethernet
>> > bridge is always the same, the host main ethernet interface one.
>> > I don't know the exact reason for this, but I'm sure it is an important
>> > BUG for all who use veths with ethernet bridge.
>> > Please, solve it as soon as you can.
>> > Thanks.
> This is a feature (I don't remember where I read it, but it's documented
> somewhere): under Linux, a bridge's MAC address takes the numerically
> *lowest* value amongst those of the bridged interfaces which belong to it.
> FE:FF:FF:FF:FF:FF is the higher possible locally-defined unicast MAC
> address value and therefore is the least prone to interfere with the
> bridge's MAC (unless there are no other MAC addresses into the bridge).
> So the bridge-side of veths (not the VE-side, which will be visible on
> the network and should remain unique) SHOULD ALWAYS be FE:FF:FF:FF:FF:FF
> for convenience, or at least be chosen higher than any other MACs
> present on the system (FE:xx:xx:xx:xx range is a good choice).
> To my knowledge, mention about this is extremely sparse in OpenVZ's
> documentation, and*not* taken into account by vzctl when automatically
> generating MAC addresses with "vzctl --netif-add" with blank MAC
> parameters. This may be considered as a bug.
> -- Benoit BRANCIARD Pôle Infrastructures Centre de ressources
> informatiques et du réseau (CRIR) Université Paris 1 Panthéon-Sorbonne
> http://crir.univ-paris1.fr Tel. 01 44 07 89 68
Aquest missatge ha estat analitzat per MailScanner
a la cerca de virus i d'altres continguts perillosos,
i es considera que està net.
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