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DHCP Problem

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by cannond5

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Okay, I screwed up when submitting the last question...so I'll try again. I have an NT network, with a PDC and BDC. DHCP is set up, as well as Wins. They are setup to replicate between themselves, push/pull partners. The problem is, that about everytwo weeks, the PCs cannot log on, unless an IP address is manual set...it's like all of a sudden, the DHCP is not working. There are no errors in the Event viewer on either server. HELP!! I will appreciate ANY suggestions as the cause of this, and will be extremely grateful to any fixes!!

4 replies

by calves

I wonder if you have a limit number of IPs for distribuition. A network without a porxy or firewall will likely use real IP addresses and normaly, the number is limited.
If the above situation applies to you, check the leases on DHCP to see how many IPs do you have left. Likely, because of the default lease period is 3 days, and many processes requires an IP lease that will not be released for 3 days, you might be running short.
Solution, decrease the lease time to 1 day or even 12 hrs.
That will help you reclaim the IPs not been used on the network.

Good Luck!

by cannond5

Well,I'd like to thank both answers that I received...they got me on the right track to solve the question...It seems that the previous admin had set the subnet mask in the scope incorrectly. Once I deleted and recreated the scope, everything was fine. Thanks people!!!

by nrodriguez

check you scope. how many ip's do you have? are they all being used? if they are private (ex. 192.168.1.x-255) put any nic in your server and add another network (192.168.2.X-255) Also what kind of switch do you have. Dlink and some other had some boot up problems that would not let traffic pass through the switch until it was completely booted. This is bad b/c if you are asking for ip's at the same time too bad so sad.

Another thing is STA Spanning Tree Algorithm. This keeps traffic from coming into the same port that data came from. this keeps data from looping. Dlink and others have problems. Usually you have to disable it.

hope this helps.

by cannond5

Well,I'd like to thank both answers that I received...they got me on the right track to solve the question...It seems that the previous admin had set the subnet mask in the scope incorrectly. Once I deleted and recreated the scope, everything was fine. Thanks people!!!

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