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Chapter 11 NAT
LTE3316-M604 User’s Guide
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Use the ALG screen to enable or disable SIP (VoIP) ALG (Application Layer Gateway) in the LTE
(Section 11.5 on page 99).
11.2 General Settings
Use this screen to enable NAT and set a default server. Click Configuration > Network > NAT to open the
General screen.
Figure 49 Configuration > Network > NAT > General
The following table describes the labels in this screen.
11.3 Port Forwarding
Use this screen to forward incoming service requests to the servers on your local network and set a
default server. You may enter a single port number or a range of port numbers to be forwarded, and the
local IP address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can support
more than one service (for example both FTP and web service), it might be better to specify a range of
port numbers.
Table 34 Configuration > Network > NAT > General
LABEL DESCRIPTION
Network Address
Translation (NAT)
Network Address Translation (NAT) allows the translation of an Internet protocol address
used within one network (for example a private IP address used in a local network) to a
different IP address known within another network (for example a public IP address used on
the Internet).
Select Enable to activate NAT. Select Disable to turn it off.
NAT Loopback NAT loopback allows local users to use a domain name to access a server on the local
network. A packet sent to the public (WAN) IP address is always forwarded to the default
gateway (the LTE). With NAT loopback enabled, the LTE uses the WAN interface’s IP address
as the packet’s source address and treats the packet as if it came from the WAN interface.
The packet then can be forwarded to the local server according to the port forwarding rule.
Select Enable to activate NAT loopback. Select Disable to turn it off.
Cancel Click Cancel to begin configuring this screen afresh.
Apply Click Apply to save your changes back to the LTE.
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