Computers are not connecting to the domain DHCP server

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ASKER

Yes the DNS settings are hard coded. Most of the computers were originally set with manual IPs. I built a new DHCP server and I want all the computers to get their IP from it.

I did a release/renew on one of the computers and when it got the new IP, the DNS was incorrect. It was 8.8.8.8, 2.2.2.2
So I had to manually enter it to the DNS server.

Yeah, you don't want to use any external DNS for domain-joined computers. They should only ever look to your active directory DNS.

Why implement DHCP but then hard-code all of your workstation DNS servers? Seems like extra work since the DHCP server can easily provide that info to the workstations as well. In fact I believe it does this by default. My DHCP server provides IP address, gateway and DNS. Just something to consider.

ASKER

I understand. But I'm trying to figure out is why it's not getting the DNS server? Any ideas?

SOLUTION

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ASKER

What I said was when I set the computer to obtain DNS automatically it didn't get the DNS server. It got the 8.8.8.8. I think I might have the scope set up wrong on the DHCP server I will check it

You also mentioned this is only happening on some computers. Others are working fine. Which would lead me to believe your Microsoft DHCP is set up correctly. Sounds like maybe these other workstations are somehow hard-wired to your ISP router or its WiFi.

ASKER

I'll do some checking and get back to you thank you

ASKER

I checked the scope and it was my fault. I had the router pointing to the ISP. I've changed the router to the DNS server.

The computer I am testing has Obtain automatically for both IP and DSN. When I rebooted the computer, it had the ISP as the DHCP server and 8.8.8.8 and 2.2.2.2 as the DNS servers

ASKER

Do you think I'm going to have to do a release/renew?

Yes. Or even better once you have your router updated I would just reboot the workstations. Let them do a new DHCP request and from there on you should be good. Make sure there are no static assigned PCs left.

ASKER

I've rebooted the one computer twice it's still getting the original ISP

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ASKER

I think I'm going to enter all the IP addresses manually reboot the computer so we'll have everything it should then set everything back to automatic and see what happens. Your thoughts on this

SOLUTION

David Johnson, CD

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ASKER

I'm not sure if I have access to the ISP router

ASKER

I do have access to the Sonicwall which is the original Router IP. How do I disable it issuing IPs?

CompProbSolv

When you have a computer with the wrong DNS address, run ipconfig /all on it. Look at what it is using as a DHCP server. As E C implied, you likely have the DHCP server on the firewall/router active. That should be shut off.

If you look around the Sonicwall's interface, you should find LAN settings that include DHCP settings. You should be able to turn it off there.

CompProbSolv

This should do it:
https://www.sonicwall.com/support/knowledge-base/disabling-the-sonicwall-dhcp-server-to-use-another-outside-the-firewall-utm-appliance/170505775845010/

ASKER

E.C. and David's post about disabling DHCP on the ISP, solved all the issues.

Thanks to all.

Stay Safe

CompProbSolv

Glad to hear it.

Do remember the ipconfig /all trick to point you to the DHCP server being used (as well as other things). I find that most of the work of troubleshooting is analyzing the symptoms; the fix is often easy. This is a good example of that.