[Users] Re: network problems: eth0: received packet with own SOLVED and POSSIBLE BUG *WARNING*)

[frank]

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.

Frank


Al 20/05/10 18:00, En/na users-request at openvz.org ha escrit:
> Date: Thu, 20 May 2010 09:14:11 +0200
> From: frank<frank at si.ct.upc.edu>
> Subject: [Users] Re: network problems: eth0: received packet with own
> 	address as source address
> To: users at openvz.org
> Message-ID:<4BF4E143.5090101 at si.ct.upc.edu>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi again,
> I have more specific information about this.
>
> Problem seems to be related with the addition of veth to bridge
> interface. Main Host interface eth0 is joined to a bridge in startup in
> order to VEs can join its veths to the same subnet. This bridge has the
> host IP, and it takes its MAC from eth0. But when a VE is started, its
> veth is joined to the same bridge, and the bridge changes its MAC to
> veth one !! That's when network problems start.
>
> I have made some tests in other servers, and there, bridge MAC remain as
> eth0 MAC all the time, it does not change with veth additions.
> I don't know why bridge MAC change when a new veth is joined.
>
> Any ideas or suggestions?
> Thanks in advance.
>
> Frank
>
> Al 19/05/10 18:00, En/na users-request at openvz.org ha escrit:
>    
>> Date: Wed, 19 May 2010 09:34:31 +0200
>> From: frank<frank at si.ct.upc.edu>
>> Subject: [Users] network problems: eth0: received packet with own
>> 	address as source address
>> To: users at openvz.org
>> Message-ID:<4BF39487.5010306 at si.ct.upc.edu>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Hi,
>> we have two nodes with Red Hat 5.4 and OpenVZ, sharing a GFS filesystem.
>> kernel is 2.6.18-164.15.1.el5.028stab068.9PAE
>> We are having problems with VEs network some time ago. We have 40 VEs,
>> some of them with venet interfaces and some with veths.
>> Problem seems to be with veths ones.
>> Sometimes Nodes seems to frozen intermitently, and in the logs we see
>> messages like
>>
>> eth0: received packet with  own address as source address
>> ....
>> eth1: received packet with  own address as source address
>> ......
>>
>> We have reviewed network configurations, MAC addresses, and so on, but
>> we don't see anything wrong.
>>
>> For instance, now we are in a situation where we have one VE with two
>> veths running in one node, and if we move it to the other one,
>> the other node starts to froze and a lot of messages like later  ones
>> (wrong packets)  appear.
>>
>> We are quite worried with this, so any suggestions will be greatly
>> appreciated.
>>
>> Thanks and regards.
>>
>> Frank
>>
>>
>>
>>
>>      
>
>    


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