|We are trying to set up a system whereby a packet going to a subdomain on a particular port can then be internally routed to a particular machine.|
So, imagine we have xx.net, we can set up on our ISP that test.xx.net goes to 18.104.22.168 (One of our IP addresses). Our firewall is then set so that any traffic going into this IP address is forwarded to our domain servers internal address of 192.168.1.10. We then want to be able to set up a DNS forward zone, so that it will look at this packet, recognise it as being test.xx.net, and forward it to the machine on 192.168.1.55.
I've set up the ISP and firewall side OK, traffic to test.xx.net ends up at the domain server, but the DNS forward zone setting isn't working.