[CentOS] Trying to override MAC addr

On 08/21/2014 10:49 AM, Digimer wrote:
> On 21/08/14 10:43 AM, Robert Moskowitz wrote:
>> On 08/21/2014 10:32 AM, m.roth at 5-cent.us wrote:
>>> Keith Keller wrote:
>>>> On 2014-08-21, John R Pierce <pierce at hogranch.com> wrote:
>>>>> On 8/21/2014 7:09 AM, Robert Moskowitz wrote:
>>>>>> I am trying to override the mac addr.
>>>>> pretty sure you need to use NIC model specific utilities to do this,
>>>>> ifcfg-ethN won't do it.   the hwaddr= in there is for finding the nic,
>>>>> not for reprogramming it.
>>>> ifconfig claims to support it:
>>>>
>>>>           hw class address
>>> <snip>
>>> Also, don't forget /etc/udev/rules.d/70-persistant-net.rules
>> I can't forget what I don't know.  please point me to description of
>> these rules?
> It's used to assign names to physical devices via udev. How it works
> depends a bit on your version.
>
> It's discussed as part of these tutorials:
>
> CentOS 6:
> https://alteeve.ca/w/Changing_the_ethX_to_Ethernet_Device_Mapping_in_EL6_and_Fedora_12_to_14

Ah.  A bit:

# cat /etc/udev/rules.d/70-persistent-net.rules
# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# net device ()
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", 
ATTR{address}=="02:c4:03:82:c1:5
3", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"

# net device ()
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", 
ATTR{address}=="02:c3:04:01:77:c
3", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

===========================================

So I can pull that eth1 line that got generated error and change the 
eth0 line?

Well I did that, took the macaddr and hwaddr lines.  restarted network 
and it was not finding eth0.  And it added eth1 back into 
/etc/udev/rules.d/70-persistent-net.rules.

I cleaned that up, and rebooted.  During the boot, I see the message:

Bringing up interface eth0:  Device eth0 does not seem to be present, 
delaying initialization.
[FAILED]

and once I get started, ifconfig reports eth1 again, and the eth1 line 
got added to rules.  But the network IS working with addresses I want.  
But on eth1 with the errors about eth0.

So there seems to be something before rules that is needed to be edited, 
or there is some limitation on my driver(s).