Problems with DHCP server after decommissioning old 2003 DC
I am having a problem with my DHCP server or should I say my network. I have had an old Windows 2003 DC on my network which used to control DNS, DHCP, WINS, Etc.. but over the years I have moved those services off that server and on to new servers (Windows 2008 R2 and Windows 2012 R2) and everything has been working great.
Over the weekend I decided to decommsion that server and move the FSMO roles over to one of the newer servers (Windows 2012R2) and raise the domain from 2003 to 2008R2 since I still have 2008R2 DC's on my network. Everything seemed to go fine but now I am experiencing issues with some of the workstations.
When I look at the configuration of the workstation it is set to DHCP but when I run ipconfig /all it shows the old DC that I decommissioned as the DHCP server and the DNS servers that are on those workstations are incorrect. When I manually add the DNS to the network config it works fine but if I remove then we are back to square one. I have ipconfig /release and ipconfig /renew with no success. I looked at my DHCP scope options and Reservations and found that some of the problem machines were on the reservations list so I deleted those machines, restarted/powered off but when they come back up still the same symptoms.
What can I do to fix this issue or where do I start?
Over the weekend I decided to decommsion that server and move the FSMO roles over to one of the newer servers (Windows 2012R2) and raise the domain from 2003 to 2008R2 since I still have 2008R2 DC's on my network. Everything seemed to go fine but now I am experiencing issues with some of the workstations.
When I look at the configuration of the workstation it is set to DHCP but when I run ipconfig /all it shows the old DC that I decommissioned as the DHCP server and the DNS servers that are on those workstations are incorrect. When I manually add the DNS to the network config it works fine but if I remove then we are back to square one. I have ipconfig /release and ipconfig /renew with no success. I looked at my DHCP scope options and Reservations and found that some of the problem machines were on the reservations list so I deleted those machines, restarted/powered off but when they come back up still the same symptoms.
What can I do to fix this issue or where do I start?
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Then open the DHCP console:
1. Have you configured Server Options?
DHCP -> IPv4 -> Server Options -> Configure Options -> Add:
006 DNS Servers = DNS server IP adresses, use all if possible
015 DNS Domain name = FQDN
2. Have you configured Scope Options?
DHCP -> IPv4 -> YourScope -> Scope Options -> Configure Options -> Add:
003 Router = default gateway IP address
006 DNS Servers = DNS server IP adresses, use all if possible
015 DNS Domain name = FQDN
3. DHCP -> right-click the IPv4 -> DNS tab -> make sure that "Allways dynamically update DNS records" and "Discard A and PTR records..." options are checked.
4. Have you pointed the router to the new DHCP server? If not, add the IP helper-address on the main router. People usually forget this.
Additionally, check there are no entries of the old server in Active Directory Sites and Services, Active Directory Domains and Trust. If you find any, delete them.