Chapter 10 NAT
LTE3311 Series User’s Guide
96
Figure 59 Network > NAT > Port Trigger
The following table describes the labels in this screen.
10.5 ALG Screen
Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows SIP calls
to pass through NAT by examining and translating IP addresses embedded in the data stream.
When the LTE3311 registers with the SIP register server, the SIP ALG translates the LTE3311’s
private IP address inside the SIP data stream to a public IP address. You do not need to use STUN
or an outbound proxy if your LTE3311 is behind a SIP ALG
Table 40 Network > NAT > Port Trigger
LABEL DESCRIPTION
# This is the rule index number (read-only).
Name Type a unique name (up to 15 characters) for identification purposes. All characters are
permitted - including spaces.
WAN Interface Select the WAN interface through which the matched packets are transmitted.
Incoming Port Incoming Port is a port (or a range of ports) that a server on the WAN uses when it sends
out a particular service. The LTE3311 forwards the traffic with this port (or range of ports)
to the client computer on the LAN that requested the service.
Start Port Type a port number or the starting port number in a range of port numbers.
End Port Type a port number or the ending port number in a range of port numbers.
Trigger Port The trigger port is a port that causes (or triggers) the LTE3311 to record the IP address of
the LAN computer that sent the traffic to a server on the WAN.
Apply Click Apply to save your changes back to the LTE3311.
Cancel Click Cancel to begin configuring this screen afresh.
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