ZyXEL Communications Prestige 660HW Series - Manual (Page 10)

Prestige 660H/HW Series Quick Start Guide
10
4 NAT
NAT (Network Address Translation - NAT, RFC 1631) means the translation of an IP address in one network to
a different IP address in another. For example, you could translate one public IP address to multiple private IP
addresses on your LAN (SUA Only).
5 Firewall
The firewall is already enabled by default on the Prestige.
Click
Advanced
Setup and
then NAT to
open the
NAT-Mode
screen.
Select SUA
Only if you
have one public IP address and Full Feature if
you have multiple public IP addresses (for
address translation).
Select Enable SIP ALG to allow VoIP calls to
pass through NAT.
If you have
servers on your
LAN, configure
an SUA server
set to have them
visible to the
outside. From
the NAT - Mode
screen click Edit
Details and fill in
the fields as
shown.
Click Advanced Setup and
then Firewall to open the
firewall screen. The firewall
protects your LAN from
attacks from the Internet. No
traffic can enter your LAN
unless a request was
generated on the LAN first. Click Default
Policy to see
rule direction
information.
You can also
disable the
firewall here if
you want.