Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Very strange MAC addresses showing up in DHCP bindings

Hi, I have a dhcp pool on a public network and recently there are very strange MAC addresses geting dhcp from the router.

Here is an example:

10.20.2.155         0034.6564.3766.6666.    Nov 21 2011 02:43 PM    Automatic

                    3337.64

and also:

10.20.1.189         004b                    Nov 20 2011 06:07 PM    Automatic

The router is giving out IP's to both DHCP and BOOTP requests.

The IOS is pretty old, c2801-advsecurityk9-mz.124-3g.bin and I will upgrade it in the next fiew days wich will probably fix this issue. I am just curious how a client can use such an erroneus MAC address and get a DHCP binding? Or is this because of a buggy IOS?

Everyone's tags (3)
1162
Views
0
Helpful
0
Replies