Network Address Translation (Nat) - ZyXEL Communications P-3202HN-Ba User Manual

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H A P T E R
Network Address Translation
9.1 Overview
NAT (Network Address Translation - NAT, RFC 1631) is the translation of the IP
address of a host in a packet, for example, the source address of an outgoing
packet, used within one network to a different IP address known within another
network.
This chapter discusses how to configure NAT on the IAD.
See Section 9.6 on page 112
9.1.1 What You Can Do in this Chapter
• Use the General screen
settings.
• Use the Port Forwarding screen
forward incoming service requests to the server(s) on your local network.
• Use the Address Mapping screen
IAD's address mapping settings.
• Use the ALG screen
(VoIP) ALG in the IAD.
9.1.2 What You Need To Know
Inside/Outside and Global/Local
Inside/outside denotes where a host is located relative to the IAD, for example,
the computers of your subscribers are the inside hosts, while the web servers on
the Internet are the outside hosts.
Global/local 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
IAD User's Guide
for advanced technical information on NAT.
(Section 9.2 on page
(Section 9.3 on page
(Section 9.4 on page
(Section 9.5 on page 111) to enable and disable the SIP
9
(NAT)
102) to configure the NAT setup
104) to configure
108) to change your
101