I have read a few ways to do this, but not 100% sure.
I need the interfaces reliably associated to the hardware (there are more than one), so the ifcfg-ethn has the mac address in it. I need to match the mac address of an old router that is about to be removed so I need not change any dns related config.

Thanks!
jlc
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On Sat, Apr 19, 2008 at 3:02 PM, Joseph L. Casale
<jcasale@activenetwerx.com> wrote:
> I have read a few ways to do this, but not 100% sure.
> I need the interfaces reliably associated to the hardware (there are more than one), so the ifcfg-ethn has the mac address in it. I need to match the mac address of an old router that is about to be removed so I need not change any dns related config.


Modify /etc/sysconfig/network-scripts/ifcfg-ethX and remove the HWADDR
line if you have one, and add a MACADDR with the mac address you want
to use.

Beware, some network cards may protest having the mac address changed,
and using both HWADDR and MACADDR can cause issues. See
/usr/share/doc/initscripts-*/sysconfig.txt for details.

--
During times of universal deceit, telling the truth becomes a revolutionary act.
George Orwell
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>Modify /etc/sysconfig/network-scripts/ifcfg-ethX and remove the HWADDR
>line if you have one, and add a MACADDR with the mac address you want
>to use.
>
>Beware, some network cards may protest having the mac address changed,
>and using both HWADDR and MACADDR can cause issues. See
>/usr/share/doc/initscripts-*/sysconfig.txt for details.

Jim,
I appreciate the confirmation, that was the method I was going to use. I am only unsure about what *could* happen with the HWADDR in there, can eth{n} now maybe bind to a different nic under some circumstance?

How can I always force the nic in question to use this script?

Thank you!
jlc
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On Sat, Apr 19, 2008 at 3:53 PM, Joseph L. Casale <jcasale@activenetwerx.com> wrote:

>Modify /etc/sysconfig/network-scripts/ifcfg-ethX and remove the HWADDR

>line if you have one, and add a MACADDR with the mac address you want

>to use.

>

>Beware, some network cards may protest having the mac address changed,

>and using both HWADDR and MACADDR can cause issues. See

>/usr/share/doc/initscripts-*/sysconfig.txt for details.



Jim,

I appreciate the confirmation, that was the method I was going to use. I am only unsure about what *could* happen with the HWADDR in there, can eth{n} now maybe bind to a different nic under some circumstance?



How can I always force the nic in question to use this script?



Thank you!

jlc



Here is an outline of what I do to "lock-down" interfaces -- which relies

mainly on using a fairly new feature "udev":

** /etc/modprobe.conf:* make sure the lines --

************* alias eth? <driver>
****
****** are in the correct order, e.g.:

************* alias eth0 e1000

************* alias eth1 e1000
************* alias eth2 tg3

*** /etc/udev/rules.d/:* create network rules file (if needed) and
******** add lines that associate a given NIC to its eth? interface.
******** Use "udevinfo -a -p /sys/class/net/eth?" to get various

******** features or attributes to find the NIC that you want to call
** ***** eth<X>.* [Note: this seems to change from release to
******** release, so this is a little general.]* You might want to put
******** lines like:


********** Kernel==eth?* ID==0000:03:02.0 Name=eth0
********** Kernel==eth?* ID==0000:03:02.1 Name=eth1

********* or

*********** Kernel==eth?* Sys{vendor}==0x8086 Sys{device}==0x032a Name=eth0
*********** Kernel==eth?* Sys{vendor}==0x8086 Sys{device}==0x1079 Name=eth1


*** /etc/sysconfig/network-scripts/ifcfg-eth<X>:

******** As other have suggested, now put MACADDR= into these files with the
******** desired MAC address that you want the interface to be set to and

******** delete the HWADDR.

Now, reboot, test and repeat as needed:-):-) ...

I hope that helps and is useful ...

* -rak-

Note:* I just checked a Fedora 8 box and some of the above has
changed -- udev is the way to go, but be advised that this feature

appears to be evolving and changing -- hopefully for the better!




*


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>I hope that helps and is useful ...
>
> -rak-

Thanks, this looks like what I needed!
jlc
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