Log In

Come Join Us!

Are you a
Computer / IT professional?
Join Tek-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here


How to reserve an IP Address using MAC

How to reserve an IP Address using MAC

How to reserve an IP Address using MAC

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
ip dhcp pool Pool1
   domain-name test.corp.com
   dns-server 1.26.x.x 1.26.x.x
   lease 30

I added this

ip dhcp pool stager
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?

RE: How to reserve an IP Address using MAC

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?

RE: How to reserve an IP Address using MAC

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       0100.0e08.eadd.a3       Mar 07 2002 07:01 AM    Automatic       0100.14a5.4f77.19       Mar 07 2002 06:20 PM    Automatic       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

Hope this helps.


RE: How to reserve an IP Address using MAC

Thanks Rainman...

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Tek-Tips Forums free from inappropriate posts.
The Tek-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Tek-Tips forums is a member-only feature.

Click Here to join Tek-Tips and talk with other members!

Close Box

Join Tek-Tips® Today!

Join your peers on the Internet's largest technical computer professional community.
It's easy to join and it's free.

Here's Why Members Love Tek-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close