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. John