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Chapter 10 WAN
NBG6617 User’s Guide
77
10.5.3 Passthrough Screen
ALG Overview
Application Layer Gateway (ALG) allows the following applications to operate properly through the
NBG6617’s NAT.
SIP - Session Initiation Protocol (SIP) - An application-layer protocol that can be used to create
voice and multimedia sessions over Internet.
H.323 - A teleconferencing protocol suite that provides audio, data and video conferencing.
FTP - File Transfer Protocol - an Internet file transfer service.
SNMP - Simple Network Management Protocol - An application-layer protocol that can be used to
exchange management information between network devices.
RTSP - Real Time Streaming Protocol - a remote control for multimedia on the Internet.
IRC - Internet Relay Chat - An application-layer protocol that can be used to communicate in the
form of text.
The ALG feature is only needed for traffic that goes through the NBG6617’s NAT.
To change your NBG6617’s ALGs and VPN pass-through settings, click Expert Mode > WAN >
NAT > Passthrough. The screen appears as shown.
Figure 46 Expert Mode > WAN > NAT > Passthrough
Apply Click Apply to save your changes back to the NBG6617.
Cancel Click Cancel to begin configuring this screen afresh.
Table 23 Expert Mode > WAN > NAT > Port Trigger (continued)
LABEL DESCRIPTION
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