On Thursday, July 08, 2010 09:26 AM, Kahlil Hodgson wrote: > On 06/07/10 22:48, 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. >>> > > If you have two machines on the same network with the same IP address > you get behaviour like this. Had this happen once when an engineer > reset a UPSs and it took on the IP address of a main switch. > arpwatch is your friend. > Unfortunately all addresses, both internal and Internet, on this box are static and assigned so there is no hope of a collision. The dhcp server does not serve any address in the same range that the box uses internally.