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Old 11-22-2007, 11:52 AM   #1
sancho
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Registered: Sep 2003
Distribution: Ubuntu 9.04/9.10 (64-bit)
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Randomly changing MAC address?


Got a new one here that I've never seen before...

So I just bought a new Asus P5K motherboard with onboard gigabit ethernet. I'm loving it so far, but I've noticed that, even after updating my DHCP server with the new MAC address, I kept getting different IPs assigned to me. After rebooting and running "ifconfig" a few times, I've gotten the following in the "HWaddr" field on each reboot:

00:14:c1:32:2f:5c
46:B3:A0:31:AB:3C
02:90:60:61:76:BD
7A:44:E7:E2:B5:BD

If I reboot again, I'll get another MAC address (and, thus, a different IP and hostname). I've setup a DHCP server on the network for the sole purpose of assigning addresses based on static MAC addresses, so this is obviously quite frustrating. I've never seen anything like this before.

Any ideas why the MAC is changing like this?
 
Old 11-22-2007, 12:50 PM   #2
Brian1
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Registered: Jan 2003
Location: Seymour, Indiana
Distribution: Distribution: RHEL 5 with Pieces of this and that. Kernel 2.6.23.1, KDE 3.5.8 and KDE 4.0 beta, Plu
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Searching here finds many post like this. Check this one out and see if the logs have similiar events. http://www.linuxquestions.org/questi...y-boot-569576/
If not use the search to pull up other posts like this.

Brian
 
Old 11-22-2007, 08:48 PM   #3
jcliburn
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Does your box have an Attansic L1 NIC? (lspci will show you)

If yes, what is your distro and kernel version?
 
Old 11-24-2007, 10:41 AM   #4
sancho
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Yes, the board is an Abit P5K which, I have learned, has the Attansic (now Atheros?) gigabit ethernet.

I'm running Ubuntu Feisty (7.01), so I think the kernel is from the 2.6.20 series.
 
Old 11-24-2007, 11:00 AM   #5
jcliburn
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The fix for the atl1 random mac address problem went into the kernel in February 2007. All 2.6.21 and newer kernels contain the fix.
 
  


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