[CentOS] Networking just stopped working

Les Mikesell wrote:
> Chan Chung Hang Christopher wrote:
>> Christopher Chan wrote:
>>> And now the thing is working again...
>> It's not working again.
>>
>> Running tcpdump -i vlan seems to trigger something to get the network 
>> working again but as soon as I stop tcpdump...nada, zip, zilch.
>>
>> Any ideas? I see no errors in the logs whether of the switch or the box, 
>> just about everything reports fine. Would the loading of the kernel 
>> bridge module cause this?
> 
> Running tcpdump would put the interface in promiscuous mode.  Does your setup 
> need this to work?
> 

I don't think so. The thing was working fine since December last year 
until this morning. Then poof! I just realized I forgot to boot older 
kernels to check for the same problem...