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DHCP assigned IP Address

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7 replies

by jhicks

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I have an NT server that is running DHCP to assign IP addresses to all of my workstations. I have a few workstations (all WIN 2K Pro) that are spuratically dropping off the network. WHen I run ipconfig at a DOS prompt it shows an IP address assigned to the PC that resides in the reserved IP range on the DHCP server. Why is my server handing out reserved IP addresses? How do I release the IP address from the PCs? They do not show up in the DHCP manager so I have no way to revoke the IP. Does anyone have any ideas?

7 replies

by stillatit

If you run ipconfig /all you should see, among other things, the IP of the DHCP server. Make sure that this matches where you think your DHCP server is. You may have a second server handing out addresses.

ipconfig /release will release your IP address.

You might also want to double-check the station's configuration to be sure it is really using DHCP. Someone may have turned it off and plugged in a number.

Good luck.

by drfox

To release an IP address type
IPCONFIG /RELEASE from a command prompt. To renew the IP address after releasing type
IPCONFIG /RENEW from a command promt again.

I have had this occur on a Windows 2000 machine once after release and renew it didnot reoccur.

by pan 13 x

Instead of useing the poll of addresses and reserved ip config. Remove the range of ip address you want to reserve from the poll. If you have 254 ip address and you want to reserve the first 50 of them . Set you poll for x.x.x.51 - x.x.x.254 and you will no have to worry with reserved addresses being obtained.
Also If you are using a nt4.0 machine as the dhcp server, I want say get a win2k server as your pdc ad dhcp server.

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