Draytek Vigor2136 Series User Manual page 126

Protocol & Port
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II-1-11-4 ALG
ALG means Application Layer Gateway. There are two methods provided by Vigor router, RTSP
(Real Time Streaming Protocol) ALG and SIP (Session Initiation Protocol) ALG, for processing the
packets of voice and video.
RTSP ALG makes RTSP message, RTCP message, and RTP packets of voice and video be transmitted
and received correctly via NAT by Vigor router.
However, SIP ALG makes SIP message and RTP packets of voice be transmitted and received
correctly via NAT by Vigor router.
Available settings are explained as follows:
Triggering Port Start / Triggering Port End - Outgoing traffic from
the WAN destined for these port numbers be forwarded to the LAN
client that triggered the rule.
Enter the port or port range for the outgoing packets.
Incoming Services
+Add - Click to set port numbers (start and end) for the specified
protocol (TCP, UDP or TCP/UDP) for the incoming data.
Incoming Protocol - The protocol(s) of the incoming traffic.
TCP - open port(s) to TCP traffic.

UDP - open port(s) to UDP traffic.

TCP/UDP - open port(s) to both TCP and UDP traffic.

Select the protocol (TCP, UDP or TCP/UDP) for the incoming data of
such triggering profile.
Incoming Port Start / Incoming Port End - Incoming traffic from the
WAN destined for these port numbers be forwarded to the LAN client
that triggered the rule.
Enter the port or port range for the incoming packets.
Discard current settings and return to the previous page.
Save the current settings and exit the page.
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