On Fri, 2006-01-06 at 12:49, Doug Coats wrote: > different boards shared the same MAC. So on the network I had 4 NICs > with the same MACs and two of them where on the same subnet. > > I figured out how to change the MAC that the eth was reporting in the > ifcfg-eth# file and the traffic issued resolved themselves. > > My questions are: > > Has anyone seen anything like this before? I thought it was outside > of the networking standards to use the same MAC address on any two > machines in the world. Am I missing something? > Have heard of it before. I forget the manufacturer but there was a batch of NICs that had similar problem many many years ago. In the past there was a process to get MAC address blocks assigned to the company making the NICs. I assume this is still in place. In theory there should not be duplication of MAC addresses. > Do any of you for see problems using these NICs the way that I am? Just keep track of what MAC addresses you have set and make sure they come up that way during reboot. For IPv4 there should not be any problems since the MAC address should not be passed outside of your LAN. I don't even think this would cause any problems with IPv6 addressing.
