Won't release IP address

ClintDaddy · December 10th, 1999, 11:33 AM

Does anyone have any idea what makes NIC's hold on to an IP address and not release it. We have an NT network using DHCP and we have had NIC's grab an IP address and not release it. Even cutting off the computer won't release it. It has happened with both Intel and 3Com cards. Any ideas?

sj · December 10th, 1999, 04:06 PM

I have seen the same problem if you should find an answer please let me know.

SJ
sjacobson@powereng.com

ClintDaddy · December 11th, 1999, 10:34 AM

I actually did find out 2 things. Microsoft TechNet says there is a bug in DHCP that will cause it to give out the same IP twice. Contact MS for a fix because they dont give out the service pack to just anyone. That wasnt our problem however. Ours was the NIC holding on to the IP. If we set the NIC to a static IP and setup the DNS and Gateway, and got it working with the static IP, when we switched it back over to DHCP it would start working again. Hope this helps.

December 21st, 1999, 09:03 PM

HOW ABOUT USING THE WNTIPCFG COMMAND TO RELEASE AND RENEW IP ADDRESS'S

CLICK START RUN TYPE IN THE OPEN BOX WNTIPCFG
TOMR

j-man · December 27th, 1999, 10:17 PM

The problem you are having is due to the DHCP server holding the IP addresses until it's lease expires. A DHCP server will assign an IP address as each computer logs on. This address will stick in the DHCP server database until the lease is up. As far as the WNTIPCFG....I'll get back, I've never heard of this particular command. If I'm wrong about this command, please let me know.

J.

houseisland · December 30th, 1999, 09:21 AM

There is the IPCONFIG command which you can run from the dos command window.

"c:\>ipconfig /?" will display the command's usage parameters.

Among these are release and renew options.

[This message has been edited by houseisland (edited December 30, 1999).]

December 10th, 1999, 11:33 AM	#1
ClintDaddy Registered User Join Date: Aug 1999 Location: Fort Mill, SC, US Posts: 30	Won't release IP address Does anyone have any idea what makes NIC's hold on to an IP address and not release it. We have an NT network using DHCP and we have had NIC's grab an IP address and not release it. Even cutting off the computer won't release it. It has happened with both Intel and 3Com cards. Any ideas? __________________ Clint Holland Network Administrator

December 10th, 1999, 04:06 PM	#2
sj Registered User Join Date: Nov 1999 Location: Boise, Idaho Posts: 81	I have seen the same problem if you should find an answer please let me know. SJ sjacobson@powereng.com __________________ SJ ~~~~~~~~~~~~~~~~~~~~~~~~~ Its hard for a computer to make up for lack of user intelligence!!!

December 11th, 1999, 10:34 AM	#3
ClintDaddy Registered User Join Date: Aug 1999 Location: Fort Mill, SC, US Posts: 30	I actually did find out 2 things. Microsoft TechNet says there is a bug in DHCP that will cause it to give out the same IP twice. Contact MS for a fix because they dont give out the service pack to just anyone. That wasnt our problem however. Ours was the NIC holding on to the IP. If we set the NIC to a static IP and setup the DNS and Gateway, and got it working with the static IP, when we switched it back over to DHCP it would start working again. Hope this helps. __________________ Clint Holland Network Administrator

December 27th, 1999, 10:17 PM	#5
j-man Registered User Join Date: Dec 1999 Posts: 97	The problem you are having is due to the DHCP server holding the IP addresses until it's lease expires. A DHCP server will assign an IP address as each computer logs on. This address will stick in the DHCP server database until the lease is up. As far as the WNTIPCFG....I'll get back, I've never heard of this particular command. If I'm wrong about this command, please let me know. J. __________________ It's such a fine line between stupid and clever. - David St. Hubbins

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December 21st, 1999, 09:03 PM	#4
TOMR Guest Posts: n/a	HOW ABOUT USING THE WNTIPCFG COMMAND TO RELEASE AND RENEW IP ADDRESS'S CLICK START RUN TYPE IN THE OPEN BOX WNTIPCFG TOMR

December 30th, 1999, 09:21 AM	#6
houseisland Registered User Join Date: Jan 1999 Location: Canada Posts: 2,351	There is the IPCONFIG command which you can run from the dos command window. "c:\>ipconfig /?" will display the command's usage parameters. Among these are release and renew options. [This message has been edited by houseisland (edited December 30, 1999).]