DNS overview

I would appreciate someone drawing a little diagram and showing external and internal IP addresses, A records, MX records and CNAMES etc. For example, have Mac OS X Server running on one G4 behind a NAT router (port 80 forwarded to 192.168.123.102) whilst my main G4 is on 192.168.123.101, iBook is 104 and Laserwriter 16/600 PS is .100. Being a visual person, a diagram showing NAT router with static IP and C class IP addresses for say 3 machines (say a primary machine running Mac OS X server and 2 machines running client) would be most appreciated. Anyone up to the task? I have mocked up an outline here: http://www.blair.com.au/DNS.xls Does Rendezvous make this whole thing irrelevant or easier? Am still running OS X Server 10.1 Thanks Hamish