[c-nsp] Strange IOS as DHCP Client behevior

Tom Hill tom at ninjabadger.net
Sun Sep 21 17:57:50 EDT 2014

On 21/09/14 22:35, Robert Hass wrote:
> My problem is that these routers are visible in DHCP binding database with
> very strange MAC:
>           0063.6973.636f.2d30.    Dec 20 2014 11:44 AM
> Automatic
>                     3035.302e.3536.6138.
>                     2e34.6132.622d.4769.
>                     302f.30
> Do you have idea why MAC is so weird ? Rest clients - Eg. Linux or Window
> boxes MACs is displayed correctly.

That looks like EUI-64 to me. And native, too; not simply converted from
MAC/EUI-48 format.

> Anything to configure at Cisco clients to have proper MAC in binding
> database ?

Beats me. I'm guessing your other Cisco clients have EUI-64 assignments,
but how you deal with that on the server side (for static leases) isn't
something I'm going to comment on. Been quite some time since I've tried
using the IOS DHCP service.


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