Well its hard to quite understand what your saying but basically, in the zywall usg 20 there are some basic considerations-steps.
a. for each IP address (PC) you need to define a host object
b. for each function or port used you need to create a service port.
c. you then need to create a NAT virtual server rule (port forwarding), and
d. you need to make a corresponding firewall rule.
Both C and D use the services you define in A and B.--
Ain't nuthin but the blues! "Albert Collins".
Leave your troubles at the door! "Pepe Peregil" De Sevilla. Just Don't Wifi without WPA, "Yul Brenner"