DHCP pool for hardware-address

[rmorenobb]

I had thought this was working, but it isn't working after all.  Turns out that even though I have this configured on the router, the computer hardware-address 01f0.def1.9b01.df it still being assigned a different IP address rathar than the .26 that should be assigned per the config.

I have this in the config:

!

ip dhcp pool bloomberghost1-tmirg

   host 192.168.12.26 255.255.255.0

   hardware-address 01f0.def1.9b01.df

!

ip dhcp pool data

   network 192.168.12.0 255.255.255.0

   default-router 192.168.12.1

   dns-server 192.168.2.50 192.168.1.50

   lease 30

This is what I see on the router:

SF-RTR-01#show ip dhcp binding

Bindings from all pools not associated with VRF:

IP address         Client-ID/             Lease expiration       Type

                   Hardware address/

                   User name

192.168.12.7       01f0.def1.03a7.17       May 08 2013 06:35 PM  Automatic

192.168.12.8       01f0.def1.356d.43       May 08 2013 03:53 PM   Automatic

192.168.12.9       01f0.def1.9b01.df       May 08 2013 09:17 PM   Automatic

192.168.12.26       01f0.def1.9b01.df       Infinite               Manual

SF-RTR-01#

You’ll see the last two entries are the same hardware address, which is the user’s mac. 

For  some reason, it won't assign that address the .26.  Rather it gave it  an address from dhcp.

I'm researching as to why, but thought I'd post  my results. 

This location only has a router/switch no servers.  Any ideas would be helpful.

[Harold Ritter · Accepted solution]

Hi Raquel,

The value you specify on the hardware-address statement is in fact the client-identifier. The mac address is only 6 bytes long.

Configure the proper mac address on the hardware-address statement or configure

client-identifier 01f0.def1.9b01.df

instead of

hardware-address 01f0.def1.9b01.df

Hope this helps

[rmorenobb]

Great, I'll give that a try.  Funny thing is yesterday, after I left the site for this router, I was thinking that, just had yet to try it. 

Would it also make since to exclude that IP address from DHCP so that it's not given to any other client?

Thanks, let me see if that will work.

[Harold Ritter]

Hi Raquel,

It does indeed make sense to exclude the static addresses from the dynamic pool.

Regards

[cadet alain]

Hi,

It will not be given to another client  as it is tied to the client-identifier.

Before doing the manual lease you'll have to clear the dynamic binding though with clear ip dhcp binding x.x.x.x

Regards

Alain

Don't forget to rate helpful posts.

[rmorenobb]

Changing it to client-identifier is exactly what the issue was.  It was right there in front of me the whole time.  Thank you for all your help.

-Rocky