Recently during deployment of a Sun system, I had a system go down (Micorost system) do to IP conflict with the system that was being installed, no error on the Sun System. The systems were on the same network 172.20.207.x. but the duplicate IP address was never used. The outage was tracked back to the newly installs MAC.
What we did notice was that when the sytem started, and the gateway was added, routing traversed two gateways. Has anyone had a switching/routing conflict that caused duplicate ip address conflicts without using the same IP.