Chapter 11 Network Address Translation (NAT)
AMG1302-T11C User’s Guide
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The following table describes the labels in this screen.
11.6 NAT Technical Reference
This chapter contains more information regarding NAT.
11.6.1 NAT Definitions
Inside/outside denotes where a host is located relative to the AMG1302-T11C, 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.
11.6.2 What NAT Does
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) back to the inside local address before forwarding it to the original inside host. Note
that the IP address (either local or global) of an outside host is never changed.
Table 54
Network Setting > NAT > ALG
LABEL
DESCRIPTION
ALG
Enable this to make sure SIP (VoIP) works correctly with port-forwarding and address-
mapping rules.
Apply
Click this to save your changes.
Cancel
Click this to restore your previously saved settings.
Table 55
NAT Definitions
ITEM
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 AMG1302-T11C
Страница 12: ...12 PART I User s Guide ...
Страница 57: ...Chapter 4 Tutorials AMG1302 T11C User s Guide 57 Tutorial Advanced QoS Class Setup ...
Страница 60: ...60 PART II Technical Reference ...
Страница 142: ...Chapter 10 Quality of Service QoS AMG1302 T11C User s Guide 142 Figure 66 QoS Class Setup Add Edit ...
Страница 298: ...Appendix H Legal Information AMG1302 T11C User s Guide 298 Environmental Product Declaration ...