P-2304R-P1 Series User’s Guide
259
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P P E N D I X
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NAT
NAT 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.
NAT Definitions
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 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.
Note that inside/outside refers to the location of a host, while global/local refers to the IP
address of a host used in a packet. Thus, an inside local address (ILA) is the IP address of an
inside host in a packet when the packet is still in the local network, while an inside global
address (IGA) is the IP address of the same inside host when the packet is on the WAN side.
The following table summarizes this information.
"
NAT never changes the IP address (either local or global) of an outside host.
Table 125
NAT Definitions
TERM
DESCRIPTION
Inside
This refers to the host on the LAN.
Outside
This refers to the host on the WAN.
Local
This refers to the packet address (source or destination) as the packet travels on the LAN.
Global
This refers to the packet address (source or destination) as the packet travels on the
WAN.
Содержание P-2304R
Страница 1: ...www zyxel com P 2304R P1 Series VoIP Station Gateway User s Guide Version 3 60 10 2006 Edition 1...
Страница 2: ......
Страница 8: ...Contents Overview P 2304R P1 Series User s Guide 8...
Страница 26: ...26...
Страница 32: ...Chapter 1 Introducing the ZyXEL Device P 2304R P1 Series User s Guide 32...
Страница 40: ...Chapter 2 Introducing the Web Configurator P 2304R P1 Series User s Guide 40...
Страница 73: ...73 PART II Network WAN 75 LAN 85 NAT 97...
Страница 74: ...74...
Страница 105: ...105 PART III VoIP SIP 107 Phone 121 Phone Book 129...
Страница 106: ...106...
Страница 116: ...Chapter 9 SIP P 2304R P1 Series User s Guide 116 Figure 60 VoIP SIP SIP Settings Advanced...
Страница 128: ...Chapter 10 Phone P 2304R P1 Series User s Guide 128...
Страница 134: ...Chapter 11 Phone Book P 2304R P1 Series User s Guide 134...
Страница 135: ...135 PART IV Security and Management Firewall 137 Content Filter 145 Static Route 149 Bandwidth MGMT 153 Remote MGMT 165...
Страница 136: ...136...
Страница 144: ...Chapter 12 Firewall P 2304R P1 Series User s Guide 144...
Страница 148: ...Chapter 13 Content Filter P 2304R P1 Series User s Guide 148...
Страница 152: ...Chapter 14 Static Route P 2304R P1 Series User s Guide 152...
Страница 173: ...173 PART V Maintenance and Troubleshooting UPnP 175 System 187 Logs 195 Tools 209 Troubleshooting 215...
Страница 174: ...174...
Страница 186: ...Chapter 17 UPnP P 2304R P1 Series User s Guide 186...
Страница 194: ...Chapter 18 System P 2304R P1 Series User s Guide 194...
Страница 208: ...Chapter 19 Logs P 2304R P1 Series User s Guide 208...
Страница 220: ...Chapter 21 Troubleshooting P 2304R P1 Series User s Guide 220...
Страница 222: ...222...
Страница 228: ...Appendix A Product Specifications P 2304R P1 Series User s Guide 228...
Страница 258: ...Appendix E SIP Passthrough P 2304R P1 Series User s Guide 258...
Страница 290: ...Appendix I Legal Information P 2304R P1 Series User s Guide 290...