How do I release an Ip address from a cisco DHCP pool

I have a machine that will not release its ip address.  It gets it address from DHCP server setup on cisco 2600 router.  I have had the user turn the machine off then back on and it still gets the same address.  The machine is setup for DHCP.  I even set the DHCP lease on the router to 0 0 1.
bryantcAsked:
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Istvan KalmarHead of IT Security Division Commented:
HI,

ip dhcp pool LAPTOP
   host 10.0.0.252 255.255.0.0
   client-identifier 0100.140b.42db.57
   netbios-name-server 10.168.1.10
   domain-name scinetwork.hu
   default-router 10.0.0.1
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Justin EllenbeckerIT DirectorCommented:
clear ip dhcp binding * (clears all)
clear ip dhcp binding X.X.X.X (clears specific)
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Justin EllenbeckerIT DirectorCommented:
what ikalmar posted is a how to create a reservation but if you want the binding deleted so that another device can get that address or so that your laptop gets a new address use what I put.  Also as a note there is a chance if it is the next address in the pool and no other devices request an IP it may still get that IP.
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Justin EllenbeckerIT DirectorCommented:
clear ip dhcp binding ?
  *        Clear all automatic bindings
  A.B.C.D  Clear a specific binding

Here is the output of the command taken from my 2621 at home.
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bryantcAuthor Commented:
I excluded the address x.x.x.244 they were using and I also did a clear ip dhcp binding on the address.  The user still gets the same address when they reboot.  I excluded the address because I want to make it static for a polycom video unit.
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Justin EllenbeckerIT DirectorCommented:
On the laptop before rebooting have you gone into the command prompt and done "ipconfig /release"  this will actually do a let go more than a reboot may.  Then You said its an exclusion have you created the static entry for the polycom unit?  Also you may want to clear the NAT table and arp cache on the router so that it can completely forget the mac address of your laptop.
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Istvan KalmarHead of IT Security Division Commented:
ok, if you want to use DHCP use my suggestions.....
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Justin EllenbeckerIT DirectorCommented:
Not sure why I referred to it as a laptop must be residual from another thread.  Sorry again.
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bryantcAuthor Commented:
Thanks, this worked
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