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Chapter 2: Advanced Setup Options 21
Lease Time
Measured in
days/hours/minutes/seconds. Default is
1 day: After that time expires, lease is
automatically renewed.
User Mode
Default is Multi-User.
2.4 NAT Firewall
The X4’s built-in NAT (Network Address Translation) firewall
provides a good level of protection from unauthorized access.
NAT keeps private a network’s internal IP addresses and presents
to the Internet one public IP address. With NAT, only one LAN
user can use the public IP address. NAT’s more robust
counterpart, NAPT (Network Address Port Translation), allows
specified LAN users to share the one public IP address. Both
NAPT and NAT are transparent to end users.
Your X4’s NAT firewall is enabled by default; the default setting is
dynamic NAPT
—everything is automatic. With dynamic NAPT,
anyone can use the public IP address (that is, the modem’s WAN
IP address). You shouldn’t need to change this setting. However, if
your service provider instructs you to disable it (or change it), go to
the
Advanced Setup
page and click the
NAT
button.