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DHCP Subnet Mask Error

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7 replies

by chris.rodgers

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In my network on some computers running Win 98 and XP Pro, when the computer goes to get a DHCP address it gets the wrong subnet mask but the right IP address, what they're getting is 255.0.0.0 but what it should be is 255.255.0.0. I can then do a release renew and it works? The only common thing between all of them is they're running Office XP

7 replies

by timwalsh

Office XP should really have nothing to do with your problem.

The subnet mask distributed by DHCP is the subnet mask assigned to the DHCP scope. Make sure you have the correct subnet mask assigned. Also make sure you don't have a rogue DHCP server giving out IP addresses.

by jpave

I gotta agree. The problem is not the clients but the dhcp server handing out addresses. If you have more than 1 dhcp server working on the same subnet you have problems unless they are set up to work on separate ip's. Check to see if more than one server is your dhcp server also see if one of your smart routers aren't equipped with dhcp capeability.

by jpave

I gotta agree. The problem is not the clients but the dhcp server handing out addresses. If you have more than 1 dhcp server working on the same subnet you have problems unless they are set up to work on separate ip's. Check to see if more than one server is your dhcp server also see if one of your smart routers aren't equipped with dhcp capeability.

by rsutterlin

I manage a small business network of 15-20 computer in a workgroup with a win2000 server serving internet connection sharing and therefore DHCP.Occasionally many of my users will lose their ips with all that goes along with that. release renew gets us back up but I don't know why this happens. Your suggestion regarding a second server trying to simultaneously provide DHCP service sounds likely. I am wondering if there is a way to verify this short of physically examining each box or perhaps do you know of other possible causes?

by chris.rodgers

I've tried shutting down the DHCP server before and couldn't get another adress, I've downloaded a DHCP find program and it only came up with one DHCP server, all my routers are configured correctly. The Subnet mask in the scope is correct, I've also had the same problem with a Unix DHCP server before I switched it to the Win2k box? I'm at a loss, it's only certain computers that are doing it and the only thing they have in common is Office XP I know that shouldn't have anything to do with it but I have no clue?

by eym

I suggest you try to inactivate the scope on win2000 server, do the release/renew on the client. If you get an IP address, you have another DHCP server activated, could be the router.

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