ZyXEL Communications ZYWALL10 - Manual (Page 219)

ZyWALL 10 Internet Security Gateway
19-8 Example Firewall Rules
Figure 19-7 Configuring A POP Custom Port
Step 4. Now, you will create rules to block all outgoing traffic (from the local network to the Internet)
except for traffic originating from the HTTP proxy server and our mail server. Click Internet to
see the Rule Summary screen. Now click an available No. (rule number) button, then click Edit
to bring up the next screen.
Type a name for this custom port
and select TCP service.
Click Apply when you’ve finished.
Click Single and enter a port
number of 110.