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Chapter 11 Network Address Translation (NAT)
ADSL Series User’s Guide
181
Address) is the source address on the WAN. For incoming packets, the ILA is the destination
address on the LAN, and the IGA is the destination address on the WAN. 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 (and TCP or UDP source port numbers for Many-to-One and
Many-to-Many Overload NAT mapping) in each packet and then forwards it to the Internet. The
ZyXEL Device 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 89
How NAT Works
192.168.1.13
192.168.1.10
192.168.1.11
192.168.1.12
SA
192.168.1.10
SA
IGA1
Inside Local
IP Address
192.168.1.10
192.168.1.11
192.168.1.12
192.168.1.13
Inside Global
IP Address
IGA 1
IGA 2
IGA 3
IGA 4
NAT Table
WAN
LAN
Inside Local
Address (ILA)
Inside Global
Address (IGA)
Содержание P-660HN-F1
Страница 2: ...Videos ADSL Series User s Guide 2 Videos File Sharing Video Example 55 QoS Video Example 76...
Страница 6: ...Document Conventions ADSL Series User s Guide 6 Server Firewall Router Switch...
Страница 8: ...Safety Warnings ADSL Series User s Guide 8...
Страница 10: ...Contents Overview ADSL Series User s Guide 10...
Страница 19: ...19 PART I User s Guide...
Страница 20: ...20...
Страница 26: ...Chapter 1 Introduction ADSL Series User s Guide 26...
Страница 40: ...Chapter 2 Introducing the Web Configurator ADSL Series User s Guide 40...
Страница 80: ...Chapter 3 Tutorials ADSL Series User s Guide 80...
Страница 81: ...81 PART II Technical Reference...
Страница 82: ...82...
Страница 130: ...Chapter 6 Wireless ADSL Series User s Guide 130...
Страница 160: ...Chapter 8 Routing ADSL Series User s Guide 160...
Страница 164: ...Chapter 9 DNS Route ADSL Series User s Guide 164...
Страница 182: ...Chapter 11 Network Address Translation NAT ADSL Series User s Guide 182...
Страница 190: ...Chapter 13 Firewall ADSL Series User s Guide 190...
Страница 202: ...Chapter 15 Certificates ADSL Series User s Guide 202...
Страница 222: ...Chapter 16 VPN ADSL Series User s Guide 222...
Страница 226: ...Chapter 17 System Monitor ADSL Series User s Guide 226...
Страница 228: ...Chapter 18 User Account ADSL Series User s Guide 228...
Страница 242: ...Chapter 24 Backup Restore ADSL Series User s Guide 242...
Страница 246: ...Chapter 25 Diagnostic ADSL Series User s Guide 246...
Страница 254: ...Chapter 26 Troubleshooting ADSL Series User s Guide 254...
Страница 262: ...Chapter 27 Product Specifications ADSL Series User s Guide 262...
Страница 302: ...Appendix B Setting Up Your Computer s IP Address ADSL Series User s Guide 302...
Страница 310: ...Appendix C Pop up Windows Java Script and Java Permissions ADSL Series User s Guide 310...
Страница 334: ...Appendix E Common Services ADSL Series User s Guide 334...
Страница 355: ...Appendix F Open Software Announcements ADSL Series User s Guide 355...
Страница 356: ...Appendix F Open Software Announcements ADSL Series User s Guide 356...
Страница 360: ...Appendix G Legal Information ADSL Series User s Guide 360...