[CentOS] Networking just stopped working

[Christopher Chan]

On Thursday, July 08, 2010 09:40 PM, JohnS wrote:
>
> On Thu, 2010-07-08 at 07:51 -0500, Les Mikesell wrote:
>> I think some bridge or vlan scenarios require promiscuous mode (and the
>> corresponding disabling of hardware acceleration).  Maybe the real issue is that
>>    something accidentally disabled it and you now only work when tcpdump
>> re-enables it.  I'm not sure how this is supposed to be managed atomically when
>> multiple programs may manipulate it and it needs to be propagated across
>> multiple bonded nics, but maybe something went wrong there.  At least some
>> things log the change so maybe you can get a hint about when it was turned on
>> and off.
> ---
>
> Check out /proc/net/bonding/bond/YOUR_BOND.  Make sure your slave IDs
> are the same as in aggregator ID.  If not it will cause the problem your
> having.  Bad NIC hardware also it's failing over for a reason as the log
> showed.
>

They check out. What did help besides running tcpdump forever was to do 
a 'service network restart'. That made the network behave. I wonder 
what's going on...