Some things to try (though I'm pretty tired atm so if I talk nonsense please forgive me):
enable nat reflection at system>advanced. This way your server should be accessable even by it's WAN IP enable "Register DHCP leases in DNS forwarder" at services>dns forwarder. this way your dhcp clients should be resolvable via their hostname add forwarding DNS-Servers for your clientsdomain if you are running another dns server for these clients at services>dns forwarder
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