i may have been to quick jumping to conclusions. I took this for a client 
running an windows firewall.
This is a quick rework for that.
I am not sure I you are refering to how to set a certain port range for 
the server behind the firewal. 
Are you locking for the command: nsrports -P 7937-7800 
This way you lock the specific ports for the server.
On the firewall you open the respective ports.

To sign off this list, send email to listserv AT listserv.temple DOT edu and 
type "signoff networker" in the body of the email. Please write to 
networker-request AT listserv.temple DOT edu if you have any problems with this 
list. You can access the archives at 
http://listserv.temple.edu/archives/networker.html or
via RSS at http://listserv.temple.edu/cgi-bin/wa?RSS&L=NETWORKER