On Wed, Oct 13, 2010 at 12:28 PM, Boris Epstein <borepstein at gmail.com> wrote: > Hi all, > > I have what appears to be a truly puzzling problem. I've got this P4 > 32-bit machine running CentOS 5.5 with XEN that has two NICs: one > onboard, an Intel Corporation 82540EM Gigabit and one on an expansion > card, Realtek Semiconductor Co., Ltd. RTL-8169 Gigabit. The second one > is recognized as eth1. > > What's happening is, it is showing up under one of the two MAC's: > either 00:0a:cd:1a:c1:71 or 00:00:00:00:c1:71. If you reboot it the > MAC stays the same; if you shutdown and do a full powerdown it seems > to change. > > Obviously, after it goes from one MAC to another you have to play with > the start-up scripts for this interface to start up correctly and this > becomes a major annoyance. > > Any idea what all of this mess could mean? > > Thanks. > > Boris. > OK, people, here's something looks promising: http://www.centos.org/modules/newbb/viewtopic.php?viewmode=flat&order=ASC&topic_id=19571&forum=40#forumpost73378 Looks like there is a whole special repo for this sort of drivers. Has anybody used it? How is it? Anyways, I think I'd give it a try. Cheers, Boris.