[Lxc-users] Networking fails sporadically in containers on ubuntu server 12.10

[David Parks]

Oooohh, that article helps my understanding immensely, that really sounds
like the problem. 

I'm also folding a previous response from Serge that fell off the list by
accident, this all makes sense. I tried to reproduce it again today and
failed, and now I understand what Serge was saying about the mac address
being "too high".

I'll hard code the bridges MAC address to that of eth0 and see how that
goes.

-------------------------------
I think that makes sense if the vm bridge's macaddr is being changed.
If only the new container's networking goes down, then that seems less
likely to be the cause.  So I'm actually happy to hear this.

-serge

-----Original Message-----
From: Hans Feldt [mailto:hans.feldt at ericsson.com] 
Sent: Tuesday, April 02, 2013 9:46 PM
To: Serge Hallyn
Cc: David Parks; lxc-users at lists.sourceforge.net
Subject: Re: [Lxc-users] Networking fails sporadically in containers on
ubuntu server 12.10

Could it be the issue described in
http://backreference.org/2010/07/28/linux-bridge-mac-addresses-and-dynamic-p
orts/
?

I encountered that one and solved it by creating a dummy interface with the
same life cycle as the bridge.

thanks,
Hans

On 04/01/2013 02:34 PM, Serge Hallyn wrote:
> Quoting David Parks (davidparks21 at yahoo.com):
>> davidparks21 at hostOS:~$ arp -a
>>
>> ? (10.1.0.4) at c6:63:bb:a7:d8:60 [ether] on br0
>>
>> ? (10.1.0.2) at 52:54:00:12:35:02 [ether] on br0
>>
>> ? (10.1.0.45) at 32:8c:fc:c1:7f:e5 [ether] on br0
>
> Can you set the macaddr on your virtualbox nic to something lower, 
> like something starting with 22: ?
>
> 32: sounds really low for a veth peer nic, I'm surprised - mine are 
> always fe:.  In fact, looking at 
> src/lxc/conf.c:setup_private_host_hw_addr(), it makes sure to set 0xfe 
> in the first two bytes.  So why are you getting 32: ?  Hmmm.
>
> Could you also try adding '-l info -o lxc.debug' to your lxc-start 
> command on a failing container, and send the resulting lxc.debug file?  
> We're looking for output from:
>
>          DEBUG("mac address of host interface '%s' changed to private "
> 	              "%02x:%02x:%02x:%02x:%02x:%02x", veth1,
>
> thanks,
> -serge
>
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