On 08/07/10 15:41, Christopher Chan wrote: > No new boxes. Not possible for any other box to be assigned the same > ip internally via dhcp and definitely not the same Internet ip. Exactly. DHCP server would check for a conflict before assigning an address and is definitely not the source of the problem. > Perhaps you care to explain why BOTH vlan interfaces stopped working? > The odd chance that two other boxes each took one of the other ip > address? Did not know that both had stopped. Conflicting IP addresses was just a suggestion. May not be the problem at all. With bonding, breaking one might break both down at the MAC level ... Hmmm ... which bond mode are you using? > The box with the problem just so happens to be the only box using > bonding, 802.1q and a four port Qlogic Netxen NIC. I think the > chances of there being a problem between these three more likely than > some 'ghost' boxes getting assigned the same ip addresses when I am > the only admin around. If you are the only admin, then its not that likely. Then again, I once had a power spike reset a wireless router on my network without me knowing. Default settings were close by not quite right, and it took me a couple of days to track down the problem :-( If it was working, then suddenly stops, then something must have changed. I gather you have some configuration and change management system in place? Backups of conf files? K