Apple IP (AppleShare IP) Gateway - Manual (Page 39)

With either method, the MacTCP control panel opens.
3 Click an Ethernet icon in the upper section of the control panel.
If you have multiple Ethernet connections, select the one that is connected to
the IP network. The gateway will not run if you select EtherTalk or any other
type of AppleTalk network connection.
4 Click More.
The Administrator dialog box appears.
Setting up the gateway 31