At work I have the DHCP servers configured to dynamically update the DNS zone files whenever an IP address is leased. Both the forward and reverse zones are updated. If the DHCP lease is not renewed, the DNS entries in the forward and reverse zones are removed. The DNS server is configured to only allow dynamic DNS updates from an authorized DHCP server.
As long as the virtual machine is operated in Bridged-mode and the DHCP client on the virtual machine is configured correctly and passes its simple host name in the DHCPDISCOVER and DHCPREQUEST packets, this approach will work.
If you are using a DHCP server running on a typical home gateway, you will need to configure your DHCP client to perform its own updates and configure your local DNS server to accept dynamic DNS updates from arbitrary systems. The DHCP server will need to be configured to pass back the correct domain name in its DHCPOFFER packets and its responses to a DHCPREQUEST packet.
Obviously, this isn't going to work when operating in NAT or host only modes. In these modes you might be able to set something as long as you have a DNS server on the host server that is configured to support the address space assigned to the vmget8 network interface. I haven't tried this to verify the validity of this approach. At any rate you would need to configure the DHCP client to perform the dynamic DNS updates.
