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Windows XP DHCP Problem

By dessart ·
Alright, a bit complicated but I'll make it quick. One of my departments began experiencing problems with Windows XP SP2 machines getting online (most are Dell OptiPlex GX270s, the rest are various model of other Dells) via DHCP. All were able to get on fine previously.

What has started happening is the machines having problems are pulling the IP 10.0.1.10 with the Gateway/DNS/DHCP server address as 10.0.1.1. These are NOT the IPs on our subnet (no where near). Additionally when I spoke with the network engineer managing the router he informed me that at MACs for these machines are showing up in the router pulling proper IPs. Additionally, when I did 'arp -a' in windows the machines are return that there are no ARP entries.

At this point we are lost if this is network or workstation related (it's happening on about 6 different machines, all connected to the same Cisco switch, which other PCs are connecting to fine without problem).

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by lowlands In reply to Windows XP DHCP Problem

Any rogue DHCP servers on that subnet? When you do a ipconfig /all on one of the affected workstations, what is the IP of the DHCP server it returns?

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by dessart In reply to

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by YetAnotherAdmin In reply to Windows XP DHCP Problem

Can you ping 10.0.1.1 from these clients? If not the workstations are at fault, possibly require TCP/IP to be re-installed. If you can ping it then either your router is configured incorrectly or you have a rogue device. Do all clients get 10.0.1.10 or are they different? If they are the same it's probably the workstations at fault. Even a rogue device wouldn't (shouldn't be able to) give the same IP to multiple clients.

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by dessart In reply to

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by dessart In reply to Windows XP DHCP Problem

I want to amend the Question with some additional information. We have a range in the subnet is that is not assigned via DHCP, but staticly. I can input static IPS (and the appropriate subnet/gateway) into Windows and the systems are able to connect fine.

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by NZ_Justice In reply to Windows XP DHCP Problem

Is the windows fire wall turned off on the work stations? If it isn't turn it off.

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by dessart In reply to

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by rs In reply to Windows XP DHCP Problem

You have a rogue DHCP server. Most likely someone has attached a wireless router intending to use it as an access point. Less likely, another router or server that has its DHCP enabled.

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by dessart In reply to

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