How to avoid IP Conflict in Windows Server 2003

Windows Tips

Ones of the common problems when using DHCP in Windows Server is IP conflict. IP conflict occurs when two computers using the same IP address. There are a lot of reasons causing this problem. IP conflict occurs when window server using DHCP then some computers client using IP static, another reason can causing this problem is when DHCP in your server have a problem then you decide to re-install the DHCP with the same scope to replace previous DHCP. DHCP will assume all new IP free to use and will give the IP address to the computers. New DHCP didn’t check what IP which is given in previous DHCP. Restarting the computer will not solve this problem. Of course given IP static will solve this problem but like I mention above, you will have problem with IP conflict again..and again

How to make DHCP do the checking before give the IP to the computer?
Follow the steps below:

1. Click Start->All Program->Administrative Tool -> DHCP

2. Right Click the picture of the server then click properties, choose Advance tab.
In tab Advance you will see the value of Conflict detection attempt = 0.
0 (Zero) is default value from windows server, which mean there is no checking IP when DHCP given the IP to client computers.

3. Change Conflict detection attempt = 2, see the picture below



which means that the DHCP server will try as much as 2 times to find new IP before given to the client. I thinks 2 times checking the IP is enough to avoid IP conflict and not burden the network because too many checks are repeated.


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