Guest Kelvin Posted December 14, 2007 Posted December 14, 2007 I'm setting up a new PCs on the network and it is being assigend the same IP address as another device on the network. I'm running Windows XP SP2 on the workstation and Windows 2003 server... Is there some procedure I need to run on my DHCP server? Is there a database that needs to be rebuilt? If I take this new PC off the net work, I can still ping the IP address. Any help would be appreciated Kelvin
Guest Jorge Silva Posted December 14, 2007 Posted December 14, 2007 Re: My DHCP Server is giving out duplicate IP addresses... Hi Adding to Cali answer, this sometimes happens when you have more than one DHCP server giving dhcp address (check if no more dhcp servers exist in your network, or routers with dhcp enabled). This can also happen when you go to the DHCP console and manually delete the address that the DHCP server already leased, which will cause the DHCP to "think" that could give those IPs to other machine requests, to avoid this, don't manually delete those address, and also configure the DHCP to test the IP before lease that IP to some machine request, you can configure that in DHCP server properties. -- I hope that the information above helps you. Have a Nice day. Jorge Silva MCSE, MVP Directory Services "Kelvin" <someone@domain.com> wrote in message news:%23IGIz2nPIHA.5016@TK2MSFTNGP06.phx.gbl... > I'm setting up a new PCs on the network and it is being assigend the same > IP address as another device on the network. > I'm running Windows XP SP2 on the workstation and Windows 2003 server... > Is there some procedure I need to run on my DHCP server? > Is there a database that needs to be rebuilt? > > If I take this new PC off the net work, I can still ping the IP address. > > Any help would be appreciated > > Kelvin >
Guest Thorsten Kampe Posted December 14, 2007 Posted December 14, 2007 Re: My DHCP Server is giving out duplicate IP addresses... * Kelvin (Fri, 14 Dec 2007 12:17:53 -0600) > I'm setting up a new PCs on the network and it is being assigend the > same IP address as another device on the network. > I'm running Windows XP SP2 on the workstation and Windows 2003 server... > Is there some procedure I need to run on my DHCP server? > Is there a database that needs to be rebuilt? > > If I take this new PC off the net work, I can still ping the IP > address. As others have pointed out your explanation for your problem is highly unlikely. You could use dhcploc (Support Tools) or dhcpdump (runs under Linux and Cygwin) to find out the rogue DHCP server. Thorsten
Guest Andrew Williams Posted December 16, 2007 Posted December 16, 2007 RE: My DHCP Server is giving out duplicate IP addresses... Turn on DHCP Conflict Detection in DHCP on Windows Server 2003. See the link below for more information: http://technet2.microsoft.com/windowsserver/en/library/4950c160-33e0-4c7a-a0c8-ece07458699b1033.mspx This will resolve the conflict but not why you are getting the conflict. Could the other IP address be statically set on the other device on the network which is in your DHCP range? You could try a 'ping -a <IP ADDRESS>' to resolve the hostname or using NSLOOKUP. This might give you some idea of which device is causing you the problem. Andrew "Kelvin" wrote: > I'm setting up a new PCs on the network and it is being assigend the same IP > address as another device on the network. > I'm running Windows XP SP2 on the workstation and Windows 2003 server... > Is there some procedure I need to run on my DHCP server? > Is there a database that needs to be rebuilt? > > If I take this new PC off the net work, I can still ping the IP address. > > Any help would be appreciated > > Kelvin > > >
Guest Newell White Posted December 17, 2007 Posted December 17, 2007 RE: My DHCP Server is giving out duplicate IP addresses... 1) Use ipconfig /all to determine the IP address of the DHCP server that assigned the PC's IP address. 2) If it is not the server you have configured DHCP on, then clearly you have a rogue DHCP server. Otherwise, could be a rogue server or a device with fixed IP (not subscribing to DHCP). 3) In either case, exclude this address from the scope of your DHCP server and reboot the PC to get another IP. -- Regards, Newell White "Kelvin" wrote: > I'm setting up a new PCs on the network and it is being assigend the same IP > address as another device on the network. > I'm running Windows XP SP2 on the workstation and Windows 2003 server... > Is there some procedure I need to run on my DHCP server? > Is there a database that needs to be rebuilt? > > If I take this new PC off the net work, I can still ping the IP address. > > Any help would be appreciated > > Kelvin > > >
Recommended Posts