so you are using two subnets on your lan without a router between them?

your workstations are on the 192.168.0.x subnet and the default gateway is on the 10.0.0.x subnet? How are they supposed to get to the gateway? The gateway needs to be on the same subnet as your workstations. Same with the server.

Please clarify why you are using two subnets. And exactly which devices are on which subnets.

Also, which OS is your workstations using?

Your network should look something like this:

internet connection <--> router's LAN port on 192.168.0.x subnet <--> workstations and servers on same subnet.

otherwise they workstations won't know how to communicate with the gateway without a separate router between them and the gateway... which doesn't make much sense to set it up that way. same thing for your servers. If they are all on the same subnet and you can ping them, then they should be able to join the domain.

Maybe I'm just tired and missing something?

IP setup might be something like this:

router == 192.168.0.1

2kserver == 192.168.0.10
subnet mask == 255.255.255.0
gateway == 192.168.0.1
dns == ISPs dns servers

workstation#1 == 192.168.0.100
subnet mask == 255.255.255.0
gateway == 192.168.0.1
dns == ISPs dns servers or if your server is going to function as the dns server, 192.168.0.10

workstation#2 == 192.168.0.100
subnet mask == 255.255.255.0
gateway == 192.168.0.1
dns == ISPs dns servers or if your server is going to function as the dns server, 192.168.0.10

etc.