Alg Screen - ZyXEL Communications LTE3301-M209 User Manual

Figure 60 Network > NAT > Port Trigger
The following table describes the labels in this screen.
Table 40 Network > NAT > Port Trigger
LABEL
#
Name
WAN Interface
Incoming Port
Start Port
End Port
Trigger Port
Apply
Cancel

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
Chapter 10 NAT
DESCRIPTION
This is the rule index number (read-only).
Type a unique name (up to 15 characters) for identification purposes. All characters are
permitted - including spaces.
Select the WAN interface through which the matched packets are transmitted.
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.
Type a port number or the starting port number in a range of port numbers.
Type a port number or the ending port number in a range of port numbers.
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.
Click Apply to save your changes back to the Zyxel Device.
Click Cancel to begin configuring this screen afresh.
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