User Manual

Chapter 10 NAT
LTE3301 Series User’s Guide
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Fig ure 58 Network > NAT > Port Trigger
The following table describes the labels in this screen.
10.5 ALG Sc re e n
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
LTE3301 registers with the SIP register server, the SIP ALG translates the LTE3301’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
LTE3301 is behind a SIP ALG
Table 39 Network > NAT > Port Trigger
LABEL DESC RIPTION
# 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 LTE3301 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 LTE3301 to record the IP address of the
LAN computer that sent the traffic to a server on the WAN.
Apply Click Ap ply to save your changes back to the LTE3301.
Cancel Click Ca nc e l to begin configuring this screen afresh.