How to access LAN computers by host name over IPSec VPN

Has anyone figured out how to be able to get the internal LAN hostnames to resolve when connected to the IPSec VPN?  Running a Zyxel USG40.  I  have a domain controller on site that handles DHCP and DNS with local IP 192.168.1.10, so I tell the Zywall VPN client that is my DNS server.  But I still can't ping the computers on the network by hostname, only IP.  Oddly enough, if i do ping -a <ip address>, it will resolve the hostname, and then I can ping that computer by hostname... but only one that I have used ping -a with.  In addition, I can't see the computers on my network when I try to browse in Windows 10, which I would like to do to access shared folders.

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