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"


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On Monday 19 September 2011 11:04, the following was written:

> 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?

Add the hardware addresses to their ifcfg-eth# files.

HWADDR=xx:xx:xx:xx:xx:xx


--

Regards
Robert

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On 19.09.2011 23:48, Robert Spangler wrote:
> On Monday 19 September 2011 11:04, the following was written:
>
>> 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?
>
> Add the hardware addresses to their ifcfg-eth# files.
>
> HWADDR=xx:xx:xx:xx:xx:xx

That's it?! What about udev?

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Volker Poplawski wrote:
> On 19.09.2011 23:48, Robert Spangler wrote:
>> On Monday 19 September 2011 11:04, the following was written:
>>
>>> 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?
>>
>> Add the hardware addresses to their ifcfg-eth# files.
>>
>> HWADDR=xx:xx:xx:xx:xx:xx
>
> That's it?! What about udev?

You can put the hardware address in 70-persistant-net.rules.

mark

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On Tuesday 20 September 2011 04:10, the following was written:

> On 19.09.2011 23:48, Robert Spangler wrote:
> > On Monday 19 September 2011 11:04, the following was written:
> >> 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?
> >
> > Add the hardware addresses to their ifcfg-eth# files.
> >
> > HWADDR=xx:xx:xx:xx:xx:xx
>
> That's it?! What about udev?

Do not know. Never had to touch udev rules for my network.


--

Regards
Robert

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