> MatsK wrote: >> Les Mikesell wrote: >>> I have a number of machines that have 4 NICs, two of which are actually in >>> use, running Centos 5. When they are rebooted, they seem to change the >>> eth interface names, assigning them in different orders. I'm a little >>> fuzzy on the details because they are at a remote location and I can't >>> access them easily - especially after the network breaks. Shouldn't: >>> alias eth0 bnx2 >>> alias eth1 bnx2 >>> alias eth2 e1000 >>> alias eth3 e1000 >>> in /etc/modprobe.conf always make the intel cards eth2 and 3? >> >> Noop, this is done with ifcfg-ethX where X is the if number. >> >> Create a /etc/sysconfig/network/ifcfg-eth0 that look like this example: >> >> DEVICE=eth0 >> HWADDR=00:01:23:45:67:89 >> ONBOOT=yes >> TYPE=Ethernet >> NETMASK=255.255.255.0 >> IPADDR=192.168.1.154 >> GATEWAY=192.168.1.1 >> >> and then create ifcfg-eth1, ifcfg-eth2, ifcfg-eth3 >> >> then do a "service network restart" to activate the settings. > > I do have the ifcfg-ethX files for the 2 interfaces that are currently > active, but since the machines were built by image copies of a master disk, > they do not have HWADDR address entries. A person on-site with access to the > console adjusted them if they didn't come up right the first time, but they > seem to shift around on each reboot. Will adding the HWADDR entry nail them > down even if it doesn't match the nic type specified in modprobe.conf? Can > someone point me to the code where this happens? Until recently the machines > were running centos 3.x and this seems to be a difference in behavior. In my experience, adding the HWADDR line to your ifcfg-ethX files will tie the network interface to the right card, regardless of modprobe.conf entries. I usually remove HWADDR lines when anaconda provides them at install time because if I replace a nic (which obviously has a different MAC address) without updating the HWADDR line, the interface fails to start. In cases where modprobe.conf is unable to order the interfaces as I want it to, I add HWADDR lines. Works every time. Hope this helps. Barry