I have installed Centos 6 on a server with two NICs. It so happens that
the NIC with the lower ARP adr is assigned 'eth1' and the NIC with the
higher ARP 'eth0'. (Not sure if this a bug but it is at least
inconvenient)
I have modified the udev rules in
/etc/udev/rules.d/70-persistent-net.rules
by swapping eth0 with eth1 in the NIC's rules.
However: the file gets changed on reboot. A third rule is automaticaly
added for some reason, for one of the NICs which already has a rule. See
below.
The system ends up with no network interface set up at all, because the
init-script gets confused.
So....
How do you specifiy the order in which NICs are enumerated?
or at least how to tell centos to stop messing with the
70-persistent-net.rules?
Regards
.....Volker
Contents of /etc/udev/rules.d/70-persistent-net.rules (arps anonymized):
(These are the two rules modified by me, assigning eth0/eth1 in
ascending arp order)
# PCI device 0x8086:0x10d3 (e1000e) (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="xx:xx:xx:xx:8f:ea", ATTR{type}=="1",
KERNEL=="eth*",
NAME="eth0"
# PCI device 0x8086:0x1502 (e1000e) (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="xx:xx:xx:xx:8f:eb", ATTR{type}=="1",
KERNEL=="eth*",
NAME="eth1"
(This is the rule which gets automaticaly added on reboot)
# PCI device 0x8086:0x1502 (e1000e) (custom name provided by external tool)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="xx:xx:xx:xx:8f:eb", ATTR{type}=="1",
KERNEL=="eth*",
NAME="eth0"