Michael Di Domenico <mdidomenico4@xxxxxxxxx> 2010-07-07 18:25: > 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. Look into udev. It should maintain some rules that dictate that mapping. If not you can potentially write/alter some to make it do what you want/expect. On my systems the place to look is generally here: /etc/udev/rules.d (user rules) /lib/udev/rules.d (system rules) There may be others. Cheers, Brian
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