Novell NETWARE 6-DOCUMENTATION Manual page 1821

110 Internetwork Packet Exchange
To restrict gateway service to selected AppleTalk networks, complete the
following steps:
1
Use a DOS ACSII text editor to create a file called MACIPXGW.DAT in
the router's SYS:SYSTEM directory.
2
Place commands in the file using the following syntax:
[exclude | include]
<net_number >[-net_number ]
. . . ]
3
Save and close the file.
4
To put your changes into effect, enter
UNLOAD MACIPXGW
REINITIALIZE SYSTEM