[CentOS] Networking just stopped working

Thu Jul 8 14:21:59 UTC 2010
Chan Chung Hang Christopher <christopher.chan at bradbury.edu.hk>

Les Mikesell wrote:
> Chan Chung Hang Christopher wrote:
>> Christopher Chan wrote:
>>> On Thursday, July 08, 2010 05:09 PM, Kahlil Hodgson wrote:
>>>> On 07/08/2010 05:08 PM, Christopher Chan wrote:
>>>>>> Hmmm ... which bond mode are you using?
>>>>> Why mode 4 of course.
>>>> Ouch.  Never used that mode.
>>> Huh? Like why? It's the recommended mode unless the switch does not 
>>> suppoprt it or the boards don't.
>> Oh sorry, got a bit grouchy there. I don't like overtime and was getting 
>> tired too. Did not read your mail properly.
> 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.

/me wonders if the loading of the bridge and another related module has 
anything to do with this.

I'll prepare a list of targets for rmmod.