ZyXEL Communications VMG5313-B10A/ VMG5313-B30A Benutzerhandbuch
VMG5313-B10A/-B30A Series User’s Guide
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H A P T E R
11
Network Address Translation (NAT)
11.1 Overview
This chapter discusses how to configure NAT on the VMG. 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.
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.
11.1.1 What You Can Do in this Chapter
• Use the Port Forwarding screen to configure forward incoming service requests to the server(s)
on your local network (
).
• Use the Applications screen to forward incoming service requests to the server(s) on your local
network (
).
• Use the Port Triggering screen to add and configure the VMG’s trigger port settings (
).
• Use the DMZ screen to configure a default server (
).
• Use the ALG screen to enable and disable the NAT and SIP (VoIP) ALG in the VMG (
).
• Use the Address Mapping screen to configure the VMG's address mapping settings (
).
• Use the Sessions screen to configure the VMG's maximum number of NAT sessions (
).
11.1.2 What You Need To Know
Inside/Outside
Inside/outside denotes where a host is located relative to the VMG, for example, the computers of
your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts.
Global/Local
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 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.
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.