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How to reserve an IP Address using MAC

quickconnect (IS/IT--Management) (OP)
8 Nov 06 14:12
I have a router (Cisco 1751) that is doing DHCP and also reserving a range of addresses also.

Now what I want to do is also reserve an IP Address to a specific MAC Address.

Currently my dhcp setting look like this

ip dhcp excluded-address 10.89.1.1 10.89.1.100
!
ip dhcp pool Pool1
   network 10.89.1.0 255.255.255.0
   domain-name test.corp.com
   dns-server 1.26.x.x 1.26.x.x
   default-router 10.89.1.1
   lease 30

I added this

ip dhcp pool stager
host 10.89.1.241 255.255.255.0
client-identifier 0100.1422.52e5.86
client-name pc37021

This does not seem to work because when I have the machine using that MAC address rebooted it still get a .113 address which is in my DHCP range.. Any thoughts?
quickconnect (IS/IT--Management) (OP)
8 Nov 06 16:15
Ok I figured out the issue, well the hard way... I appeared that after I rebooted the router it worked.. Is there another way this would of worked rather then rebooting the router?
rainman (ISP)
9 Nov 06 19:19
You can verify your DHCP server MAC > IP bindings with:

Router#show ip dhcp binding
Bindings from all pools not associated with VRF:
IP address          Client-ID/              Lease expiration        Type
                    Hardware address/
                    User name
192.168.2.128       0100.0e08.eadd.a3       Mar 07 2002 07:01 AM    Automatic
192.168.2.130       0100.14a5.4f77.19       Mar 07 2002 06:20 PM    Automatic
192.168.2.131       0100.20a6.4cdf.f4       Mar 06 2002 08:35 PM    Automatic

If you see a insistency in here you can clear the binding table with:

Router#clear ip dhcp binding ?
  *        Clear all automatic bindings
  A.B.C.D  Clear a specific binding

Clear entire table: clear ip dhcp binding *
Clear just one: clear ip dhcp binding 1.2.3.4

Hope this helps.


-Rainman
quickconnect (IS/IT--Management) (OP)
10 Nov 06 8:25
Thanks Rainman...

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