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DNS, AD, DC issues at remote sites

Last Modified: 2015-03-31
We have four subnets on our network:

192.9.100.x (Main)
192.168.4.x (Remote)
192.168.6.x (Remote)
192.168.8.x (Remote)

At those three locations DNS doesn't seem to propagate.  Also, domain controllers can't be contacted other than initial log in.  For example, I'm trying to share a user's printer so others in that office can print to it but it doesn't "see" any of the other users.  In the network mmc I should see ALL machines on network.  I only see the ones on that specific subnet.  What could be causing this.  Everything works as it should on the main subnet.
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