EX3510-B1 User’s Guide
167
C
HAPTER
11
Network Address Translation
(NAT)
11.1 NAT Overview
This chapter discusses how to configure NAT on the Zyxel Device. 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.
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
Port Triggering
screen to add and configure the Zyxel Device’s trigger port settings (
).
• Use the
DMZ
screen to configure a default server (
).
• Use the
ALG
screen to enable and disable the ALGs in the Zyxel Device (
).
• Use the
Address Mapping
screen to configure the Zyxel Device's address mapping settings (
).
• Use the
Sessions
screen to configure the Zyxel Device'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 Zyxel Device, for example, the computers
of 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.
NAT
In the simplest form, NAT changes the source IP address in a packet received from a subscriber (the
inside local address) to another (the inside global address) before forwarding the packet to the WAN
side. When the response comes back, NAT translates the destination address (the inside global address)
Summary of Contents for EX3510-B1
Page 15: ...15 PART I User s Guide...
Page 38: ...Chapter 3 Quick Start Wizard EX3510 B1 User s Guide 38 Figure 23 Wizard WiFi...
Page 55: ...Chapter 4 Tutorials EX3510 B1 User s Guide 55 Tutorial Advanced QoS Class Setup...
Page 60: ...60 PART II Technical Reference...
Page 90: ...Chapter 7 Wireless EX3510 B1 User s Guide 90 Figure 51 Network Setting Wireless General...
Page 253: ...Chapter 31 Time Settings EX3510 B1 User s Guide 253 Figure 164 Maintenance Time...
Page 265: ...Chapter 34 Firmware Upgrade EX3510 B1 User s Guide 265 Network Temporarily Disconnected...
