eberhardt2329
asked on
dhcp server running on a windows 2003 server
i have client complaining that they are getting ip conflicts they are all on dhcp how do I go about fixing this?
Lee W, MVP
Find the conflict. Something's probably set statically. Or perhaps they installed a Wireless Router recently and didn't turn off it's DHCP server?
Do you have static assigned printers? Statiic assigned access points?
Easiest way to find the answer without searching and downloading is to change the DHCP scope to a different subnet. Then Power cycle the switch they are all plugged into. (this will force a /release /renew on all the PCs) Each one will get a new IP, the node that was causing the problem will lose connection as it is no longer on the subnet. Find the broken node and fix it.
Easiest way to find the answer without searching and downloading is to change the DHCP scope to a different subnet. Then Power cycle the switch they are all plugged into. (this will force a /release /renew on all the PCs) Each one will get a new IP, the node that was causing the problem will lose connection as it is no longer on the subnet. Find the broken node and fix it.
When you have a conflict, the client states the conflicting PC's MAC address. You should check to see if you have the MAC address listed. I agree with leew that it has to be a static setting.
If you cannot identify the offending MAC, go to http://standards.ieee.org/regauth/oui/index.shtml and place the first 3 octets of the MAC to tell you who the manufacturer of the device (and possibly the PC).
Also, in the client conflict IP screen, it will mention if the PC's connection will work or not (the first PC with the IP will continue to work, while the second one will not). If the PC you are at states that TCP/IP is disabled until the conflict is resolved, then use a program like Angry IP (http://www.angryziber.com/ipscan/) and you can get the PC's hostname.
Finally, if all else fails, release and renew the IP on the client PC with problems or make the DHCP scope bigger to avoid running out of IPs.
Good luck...
If you cannot identify the offending MAC, go to http://standards.ieee.org/regauth/oui/index.shtml and place the first 3 octets of the MAC to tell you who the manufacturer of the device (and possibly the PC).
Also, in the client conflict IP screen, it will mention if the PC's connection will work or not (the first PC with the IP will continue to work, while the second one will not). If the PC you are at states that TCP/IP is disabled until the conflict is resolved, then use a program like Angry IP (http://www.angryziber.com/ipscan/) and you can get the PC's hostname.
Finally, if all else fails, release and renew the IP on the client PC with problems or make the DHCP scope bigger to avoid running out of IPs.
Good luck...
All the above is good answer.
I would try to use different DHCP Range.
It may save some time.
I would try to use different DHCP Range.
It may save some time.
Also check how many free addresses left in your scope.
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