Chapter 10 NAT
LTE3311 Series User’s Guide
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To enable and disable the SIP ALG in the LTE3311, click Network > NAT > ALG. The screen
appears as shown.
Figure 60 Network > NAT > ALG
The following table describes the labels in this screen.
10.6 Technical Reference
The following section contains additional technical information about the LTE3311 features
described in this chapter.
10.6.1 NATPort 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.
Note: Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
Table 41 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 LTE3311.
Cancel Click Cancel to begin configuring this screen afresh.
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