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#1 (**permalink**) 01-16-2008, 05:05 PM

I have a friend that thinks his HP C-series computers are having their
MAC addresses changed by application software on the computer (a control
system vendor provides the HMI application). He is suspecting this
because the upstream Cisco network switch is reporting the same MAC on
two ports even after a reset of the ports.

Is this possible? I suspect that something isn't being flushed
correctly in the switch, but really don't know.

#2 (**permalink**) 01-16-2008, 05:06 PM

Craig R <craigr@cableone.net> wrote:
> I have a friend that thinks his HP C-series computers are having
> their MAC addresses changed by application software on the computer
> (a control system vendor provides the HMI application). He is
> suspecting this because the upstream Cisco network switch is
> reporting the same MAC on two ports even after a reset of the ports.

> Is this possible? I suspect that something isn't being flushed
> correctly in the switch, but really don't know.

It is possible. I believe that lanadmin and lanscan will show the
"effective" MAC address for interfaces.

rick jones
--
oxymoron n, commuter in a gas-guzzling luxury SUV with an American flag
these opinions are mine, all mine; HP might not want them anyway...

feel free to post, OR email to raj in cup.hp.com but NOT BOTH...

#3 (**permalink**) 01-16-2008, 05:06 PM

On Fri, 05 Sep 2003 16:32:37 GMT, Rick Jones <foo@bar.baz.invalid>
wrote:

>Craig R <craigr@cableone.net> wrote:
>> I have a friend that thinks his HP C-series computers are having
>> their MAC addresses changed by application software on the computer
>> (a control system vendor provides the HMI application). He is
>> suspecting this because the upstream Cisco network switch is
>> reporting the same MAC on two ports even after a reset of the ports.
>
>> Is this possible? I suspect that something isn't being flushed
>> correctly in the switch, but really don't know.
>
>It is possible. I believe that lanadmin and lanscan will show the
>"effective" MAC address for interfaces.

Wow. Why is this possible?

I know fiddling with MAC addresses is used to do Layer-3 switching in
the 4108gl Procurve switches, but why would a workstation need to have
it's MAC altered?

#4 (**permalink**) 01-16-2008, 05:06 PM

Hi Mark

> but why would a workstation need to have it's MAC altered?
Two possibilities com to my mind:
If there is a license coupled to the MAC address.
If the application is some kind multi-node software (like MC-Serviceguard)

Florian

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HP C-series, Can Application Software Change the MAC Address?