Swapping MAC addresses?

John Oliver joliver at john-oliver.net
Wed Sep 2 18:43:37 CDT 2009


I have a 2950 with an IP address configured on each NIC.  A few weeks
ago, the network folks started asking why my primary IP was showing up
on different MAC addresses.

   Registered Macaddress = 0019.b9ca.5b46
   mac address(es) this week:      0019.b9ca.5b44
                                   0019.b9ca.5b46
   mac addresses during week 1:    0019.b9ca.5b44
                                   0019.b9ca.5b46
   mac addresses during week 2:    0019.b9ca.5b44
                                   0019.b9ca.5b46
   mac addresses during week 3:    0019.b9ca.5b44
                                   0019.b9ca.5b46
   mac addresses during week 4:    0019.b9ca.5b44
                                   0019.b9ca.5b46
   mac addresses during week 5:    0019.b9ca.5b44
   mac addresses during week 6:    0019.b9ca.5b44
   mac addresses during week 7:    0019.b9ca.5b44
   mac addresses during week 8:    0019.b9ca.5b44
   mac addresses during week 9:    0019.b9ca.5b44


eth0: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz
found at
 mem f8000000, IRQ 169, node addr 0019b9ca5b44
eth1: Broadcom NetXtreme II BCM5708 1000Base-T (B2) PCI-X 64-bit 133MHz
found at
 mem f4000000, IRQ 169, node addr 0019b9ca5b46


The cables haven't been touched.  I see nothing in the logs.  My
assumption was, there's something wrong with the switch.  They insist
the switch is fine and it's got to be the server.

Has anyone seen this before?  It isn't affecting operations, but they do
get warnings about this, and it's always nice to at least get an
explanation for weird things :-)

-- 
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* John Oliver                             http://www.john-oliver.net/ *
*                                                                     *
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