ZyXEL Communications P-660HW-Tx v3 User Manual page 195

Select WAN to LAN in the Packet Direction field.
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Firewall Example: Rules-Customized Service
Click Add to display the firewall rule configuration screen.
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In the Edit Rule screen, click the Edit Customized Services link to open the
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Customized Service screen.
Click an index number to display the Customized Services Config screen and
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configure the screen as follows and click Apply.
Return to the Edit Rule screen and configure the destination address screen and
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click Add. Delete Any from the Destination Address List.
Scroll down the Available Services list and select *Doom(TCP/UDP:666). Use
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the Add >> button to add it to the Available Services list. Use the Remove
button to remove services you do not need.
P-660HW-Tx v3 User's Guide
Chapter 9 Firewalls
195