On Wed, Jul 07, 2010 at 06:25:53PM -0400, Michael Di Domenico wrote: > I have an issue where I have an onboard NIC with effectively three > ports, no other NIC ports/chips are in the system > > Nic0: xx:xx:xx:00:00:02 > Nic1: xx:xx:xx:00:00:01 > IPMI: xx:xx:xx:00:00:03 > > When I boot RedHat Linux, Nic1 becomes Eth0 and Nic0 becomes Eth1. > > I understand there is a disconnect between BIOS and linux on which > device should get which Eth, as well as, what ensues when you have PCI > cards along side onboard ports. > > What I'm curious about is how/why Linux actually decides Nic1 should be Eth0? > > My theory is it starts on the lowest MAC address and works up, > depending partly on driver load order. > > Given the above scenario, swapping the MAC addresses between Nic1 and > Nic0 would clear this issue. > > Can anyone confirm or deny this? Or explain/point me to, how it actually works. http://lwn.net/Articles/356900/ And on a system where you can use udev rules, the 70-persistent-net.rules file can be used to make them constant, by using the MAC address to force the names to be what you want. -- Matt Domsch Technology Strategist Dell | Office of the CTO -- To unsubscribe from this list: send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
