NVG2053 User’s Guide
139
C
H A P T E R
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Network Address Translation
(NAT)
12.1 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 is changed to a different IP address known within
another network.
Each packet has two addresses – a source address and a destination address. For
outgoing packets, NAT maps private (local) IP addresses to globally unique ones
required for communication with hosts on other networks. It replaces the original
IP source address in each packet and then forwards it to the Internet. The
NVG2053 keeps track of the original addresses and port numbers so incoming
reply packets can have their original values restored. The following figure
illustrates this.
Figure 59
NAT Example
For more information on IP address translation, refer to RFC 1631, The IP Network
Address Translator (NAT).
192.168.1.13
192.168.1.12
192.168.1.11
192.168.1.10
192.168.1.10
192.168.1.10
192.168.1.11
192.168.1.12
192.168.1.13
Public IP
NAT Table
LAN
WAN
Содержание NVG2053
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Страница 8: ...Safety Warnings NVG2053 User s Guide 8...
Страница 10: ...Contents Overview NVG2053 User s Guide 10...
Страница 18: ...Table of Contents NVG2053 User s Guide 18...
Страница 19: ...19 PART I User s Guide...
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Страница 26: ...Chapter 1 Getting to Know Your NVG2053 NVG2053 User s Guide 26...
Страница 67: ...67 PART II Technical Reference...
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Страница 74: ...Chapter 5 Status Screens NVG2053 User s Guide 74...
Страница 80: ...Chapter 6 Monitor NVG2053 User s Guide 80...
Страница 130: ...Chapter 10 DHCP Server NVG2053 User s Guide 130...
Страница 144: ...Chapter 12 Network Address Translation NAT NVG2053 User s Guide 144...
Страница 150: ...Chapter 14 Static Route NVG2053 User s Guide 150...
Страница 166: ...Chapter 16 Firewall NVG2053 User s Guide 166...
Страница 200: ...Chapter 18 USB Service NVG2053 User s Guide 200...