Apple IP (AppleShare IP) Gateway - Manual (Page 61)

Limiting network access
You can control which networks the gateway will accept users from with the
network restrictions feature in the Gateway Setup dialog box.
1 Open the Gateway Manager program.
2 Stop the gateway if it is running.
You cannot make changes to gateway setup while the gateway is running.
When you click Stop the following dialog box appears:
3 Click OK.
4 Choose “Set up Gateway” from the Control Menu.
The Gateway Setup dialog box appears.
Establishing gateway security 53