Chapter 9 Network Address Translation (NAT)
AMG1302-T10A User’s Guide
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Use this screen to enable and disable the SIP (VoIP) ALG in the Device. To access this screen, click
Network > NAT > ALG.
Figure 73 Network > NAT > ALG
The following table describes the fields in this screen.
9.6 NAT Technical Reference
This chapter contains more information regarding NAT.
9.6.1 NAT Definitions
Inside/outside denotes where a host is located relative to the 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.
Table 48 Network > NAT > ALG
LABEL DESCRIPTION
Enable SIP ALG Select this to make sure SIP (VoIP) works correctly with port-forwarding and address-
mapping rules.
Apply Click this to save your changes.
Reset Click this to restore your previously saved settings.
Table 49 NAT Definitions
ITEM DESCRIPTION
Inside This refers to the host on the LAN.
Outside This refers to the host on the WAN.
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