Chapter 10 NAT
LTE3301-M209 User’s Guide
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Figure 60 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 Zyxel
Device registers with the SIP register server, the SIP ALG translates the Zyxel Device’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 Zyxel Device 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 Zyxel Device 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 Zyxel Device 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 Zyxel Device.
Cancel Click Cancel to begin configuring this screen afresh.
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