AD Server Question

I’d like to setup a small home network with a home ISP. I’m not an IT expert by any stretch of the imagination. So, I’m looking for advice in addition to technical support. I’d like to create an AD server for my Windows Network consisting of a mix of Windows 7 and Windows 10 machines. My ISP supports both IPv4 and IPv6. However, they do not allow me to define an IPv6 network. So, my first question is does the AD server have to be a router for the network? If not, how do the Windows computers access the DNS server on the Ubuntu server? If it does need to be a router, how can I route IPv6 traffic? I’m looking for the simplest solution. My modem is already serving as a router, so I really don’t need another router. So if I can avoid another router, that would be ideal. Sorry about the newbie question, but like I said, I’m just trying to centralize my Windows network using Linux.

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