ZyXEL Communications Broadband Security Gateway P-312, User Manual, Page: 210 / 254

P312 Broadband Security Gateway
19-8 Examples Firewall Rules
Figure 19-7 Configuring A POP Custom Port
Step 4. Now, we 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) radio button, then
click Edit to bring up the next screen.
Step 5.
Click SrcAdd under the Source Address box and enter the IP of the mail server (192.168.10.2)
in the same fashion as what we did in Figure 19-4 .
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.