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Bad IP addresses in DHCP

By itmanager ·
keep getting bad IP addresses in DHCP. Microsoft say service pack should resolve this but this isn't the case for us. can any one help? We have a server running windows 2000. We only started one or teo bad IPs last week now we are getting about 30 or 40 a day. We haven't loaded any software on the server, but the server crashed last week and it seems that the problem started then.

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by BFilmFan In reply to Bad IP addresses in DHCP

After a Dynamic Host Configuration Protocol (DHCP) client lease expires, it is not immediately scavenged from the database. A grace period of four hours is added to the end of the lease to prevent against clock drift between the DHCP client and server. On a Windows 2000-based DHCP server, leases are scavenged from the database if they meet the criteria of (ExpirationTime + 4 hours, but this generally is about a day).

It appears that your server is handing out addresses that have already been assigned to clients.

Have you only the one DHCP server?

Did you check the integrity of the DHCP database after the crash?

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by sgt_shultz In reply to Bad IP addresses in DHCP

depending on how big your network is, i would resolve this problem by moving away from dhcp toward static addresses for my clients. what is your exact error message and event log id's sources and descriptions?

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by aquias2000 In reply to Bad IP addresses in DHCP

I think BFilm has the right idea, look at the DHCP for corruption. If push came to shove, I'd say rebuild the server, reapply the service packs and then re-enable it on your network (What, you think weekends are for IT people to do anything personal????)

I'd give a warning about going to static (especially in large scale networks), it is more of a headache than a blessing in many ways. It adds a great deal of administrative overhead for you and the network staff to deal with.

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by astewart In reply to Bad IP addresses in DHCP

Try deleting/moving the DHCP database and getting DHCP to create a new one. This is covered in the details of KB article 173396. Don't forget to stop the DHCP service 1st.


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