Zoom Gateway/Router V3 User Manual page 51

By default, the firewall will allow only those packets to enter that
you are likely to need; for example, in response to a request for a
web page, or as part of a VoIP call you make. You may want to
accept other, specific packets, perhaps to facilitate Internet gaming,
or because you want people outside your network to access a server
you have set up. You may want to prevent some users from
accessing the Internet at all.
To access the V3's firewall settings, from the Advanced Setup
page, click the Firewall button. (If you have exited from the V3
and have forgotten how to establish communication with it, refer
to page 15.)
The main Firewall page displays.
Note: If you ever want to disable the advanced firewall, there is an
option to do so at the bottom of the page.
Chapter 4: Using the V3's Advanced Firewall 51