Questions

Some computers not updating new IP in DNS

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1 Votes
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Some computers not updating new IP in DNS

mstry9
We have 2 DNS servers and randomly when we move a machine to a different VLAN, the DNS entry never registers the new IP.
The Microsoft support person had no answer.
Any suggestions would be appreciated, except switching to Linyx :)
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3xp3rt
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Maybe you tried this, but if not, right click on Network Connection, and select Repair.

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mstry9
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We worked around it by removing them from Active Directory and re-adding them but I would like to find out what is causing it so we don't have to touch each of them when it happens.

Thanks

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mstry9
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We worked around it by removing them from Active Directory and re-adding them but I would like to find out what is causing it so we don't have to touch each of them when it happens.

Thanks

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mstry9
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We tried that, the machine did release and renew the ip address but the DNS issue remains.

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jamesatmaisonverre
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I dont think the problem is with the software but i think there is a problem with the routers or more probably the switches as your servers ip address is determined by this hardware.I work with this stuff everyday and it is usually faulty switches

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scott_heath
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Your DNS server must be set to allow updates from clients, it isn't automatic. Check you DNS server settings, it's called Dynamic DNS. Are you using 2000 or 2003 server?

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mstry9
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Our DNS servers are set to allow dynamic updates from secured clients only. Due to ou having a wireless network on campus wor the students to bring thier own laptops, we do not allow un-secured clients to update DNS records. I'll check with our System Engenier about the switch possibility but this only happens on about 3 out of every 20 new PC we add each month.
I really appreciate everyones input on this as it's not mission critical, I just have different department heads asking me about it every month. I'd like to resolve it or explain why we can't.

Please leave this thread open for now in case someone else has more input.

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CG IT
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if clients are DHCP clients and you move them from 1 VLAN to another, then when they go look for a DHCP server to get an address, that DHCP server needs to provide them with DNS servers to find a server to authenticate with. It's possible that the new VLAN they are moved to doesn't provide them with the right DNS server information. Depends on where they get the information from. If there are different DNS and DHCP servers on each VLAN, I can't see how this happens, but if the DHCP server is on another VLAN, it's possible the Relay agent doesn't do its job. As long as they are set to obtain IP and DNS automatically, shouldn't matter where you move them, they'll get their information from DHCP provided DHCP is configured correctly. IF you have AD I'd change from allow secure to active directory intergrated and then configure DNS to update associated records from clients.

really need more detailed information on your network setup.

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mstry9
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Both internal DNS servers and the DHCP server are all on the same VLAN. We have about 12 VLANS in all.
The DNS servers ARE Active Directory integrated and Dynamic updates is set to secure only?
Are you suggesting we change them to nonsecure and secure. Would this not allow any wireless laptop to run the /registerdns and create an entry in the DNS table?

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CG IT
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you said your DNS was secure updates and I suggested if it's an AD to go to AD intergrated.

VLAN is collecting switch ports into subnets. So you've got 12 subnets there, how is DHCP providing addressing? somewhere along the way in configuration, how the VLANs get their information is not providing your DNS server addresses.