Can only add to the domain servers in the same subnet as the Domain Controller.

I have a network setup with four subnets.

Inside 1
Inside 2
DMZ 1
DMZ 2

I have a domain controller running on Inside 1 and I can join servers in that same subnet to the domain with no issues. If I try to add servers from any other subnet to the domain they all fail.

I have rules in place allowing all traffic between subnets, just to rule that out. When attempting a domain add I can see traffic from the source server hitting the DC using Wireshark on the DC so I know that there are no firewall blocking issues.

I suspect my issue is one of incorrect DNS configuration.

Any help on this would be greatly appreciated.

TIA.
rob prestonAsked:
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Jason CrawfordConnect With a Mentor Exchange EngineerCommented:
Do both Domain Controllers include each other's IP address as a DNS server in the network adapter settings?

Example:

DC1
- IP Address: 10.254.1.100
- Primary DNS:10.254.1.100
- Secondary DNS: 10.254.2.100

DC2
- IP Address: 10.254.2.100
- Primary DNS: 10.254.2.100
- Secondary DNS:10.254.1.100
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rob prestonAuthor Commented:
Those settings are correct but in going back to check I straight away noticed that I had a typo in my subnet mask, so all is now working.

Thanks !!! :-)
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Jason CrawfordExchange EngineerCommented:
Happens to the best of us.  If you found my assistance helpful I would appreciate it if you would mark my comment as the solution.  Have a good one.
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