• Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 1588
  • Last Modified:

DHCP error "This address is already in use"

I have a large network (100+ nodes) on which I run Win2000 Server for DHCP. I had the lease time set to 21 days and for a year there was no problem. However, lately I've been getting a significant number of addresses with "This address is already in use" added to them in the description section. I reduced the lease time to 7 days and waited for the original 21 day leases to expire and the number of these has decreased, but I still have a dozen or so at any given time.

What is causing this and how can I fix it?
1 Solution
Have you had the subnet range inadvertently redefined?  Maybe people are hardcoding their addresses (policy enforcement) or possibly you have a rogue address provider, such as happened to at least one user when they got a new router.  Check the dhcp programs from the resource kit for finding rogues and stamp them out when found
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Tackle projects and never again get stuck behind a technical roadblock.
Join Now