Swapping MAC addresses?

Bryan bryan.madhatter at gmail.com
Wed Sep 2 19:03:44 CDT 2009


Assuming this is RHEL or equivalent, do you have a HWADDR line assigned to
each interface in network config?  Otherwise, the physical nics can show up
in different order depending on how they're enumerated on boot.

On Wed, Sep 2, 2009 at 6:43 PM, John Oliver <joliver at john-oliver.net> wrote:

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