ZyXEL Communications P-660HW-Tx v3 Series User Manual page 192

Chapter 10 Firewalls
Click an index number to display the Customized Services Config screen and
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configure the screen as follows and click Apply.
Edit Custom Port Example
Select Any in the Destination Address List box and then click Delete.
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Configure the destination address screen as follows and click Add.
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Firewall Example: Edit Rule: Destination Address
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P-660HW-Tx v3 Series User's Guide