What You Can Do In The Nat Screens; What You Need To Know About Nat - ZyXEL Communications NBG-417N - V1.0 Manual

Chapter 11 Network Address Translation (NAT)
Note: You must create a firewall rule in addition to setting up NAT, to allow traffic from
the WAN to be forwarded through the NBG-417N.

11.2 What You Can Do in the NAT Screens

• Use the General
default server.
• Use the Application
417N's port forwarding settings.
• Use the Advanced
417N's trigger port settings.

11.3 What You Need To Know About NAT

Read on for basic information on NAT and for details that can help you understand
and configure the NAT screens of your NBG-417N.
Note the following definitions that are used in this section.
Inside/outside
This denotes where a host is located relative to the NBG-417N, for example, the
computers of your subscribers are the inside hosts, while the web servers on the
Internet are the outside hosts.
Global/local
This denotes the IP address of a host in a packet as the packet traverses a router,
for example, the local address refers to the IP address of a host when the packet
is in the local network, while the global address refers to the IP address of the
host when the same packet is traveling in the WAN side.
Note: Inside/outside refers to the location of a host, while global/local refers to the IP
address of a host used in a packet.
An inside local address (ILA) is the IP address of an inside host in a packet when
the packet is still in the local network, while an inside global address (IGA) is the
118
(Section 11.4 on page
(Section 11.5 on page
(Section 11.9 on page
120) screen to enable NAT and set a
121) screen to change your NBG-
125) screen to change your NBG-
NBG-417N User's Guide