Chapter 11 Network Address Translation (NAT)
AMG1312-T Series User’s Guide
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Use this screen to enable and disable the SIP (VoIP) ALG in the AMG1312-T Series. To access this
screen, click Network Settings > NAT > ALG.
Figure 74 Network Setting > NAT > ALG
The following table describes the fields 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 AMG1312-T Series, 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.
Table 55 Network Setting > NAT > ALG
LABEL DESCRIPTION
ALG Enable the SIP ALG to make sure SIP (VoIP) works correctly with port-forwarding and
address-mapping rules.
Apply Click Apply to save your changes.
Cancel Click Cancel to restore your previously saved settings.
Table 56 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.
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