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Chapter 10 NAT
LTE2566-M634 User’s Guide
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To enable and disable the SIP ALG in the LTE2566-M634, click Configuration > Network > NAT > ALG . The
screen appears as shown.
Figure 57 Configuration > Network > NAT > ALG
The following table describes the labels in this screen.
10.5 Technical Reference
The following section contains additional technical information about the LTE2566-M634 features
described in this chapter.
10.5.1 NAT Port Forwarding: Services and Port Numbers
A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP, that you
can make accessible to the outside world even though NAT makes your whole inside network appear
as a single machine to the outside world.
Use the Port Forwarding screen to forward incoming service requests to the server(s) on your local
network. 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.
In addition to the servers for specified services, NAT supports a default server. A service request that does
not have a server explicitly designated for it is forwarded to the default server. If the default is not
defined, the service request is simply discarded.
Table 31 Configuration > Network > NAT > ALG
LABEL DESCRIPTION
ALG-SIP Select Enable to make sure SIP (VoIP) works correctly with port-forwarding and address-
mapping rules. Otherwise, select Disable to turn off the SIP ALG.
Apply Click Apply to save your changes back to the LTE2566-M634.