ZyXEL Communications ARMOR G1, User Manual

Page: 91 / 183

Chapter 9 WAN
NBG6818 User’s Guide
91
9.6 Passthrough Screen
Use this screen to change your NBG6818’s ALGs and VPN pass-through settings. Click Settings > Internet
> Passthrough to show the following screen.
ALG Overview
Application Layer Gateway (ALG) allows the following applications to operate properly through the
NBG6818’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 - An application-layer protocol that can be used to stop, pause
or play video and audio applications streaming on the Internet.
• IRC - Internet Relay Chat - An application-layer protocol that can control the relay chat applications
and allow clients to have real-time communications with others on the Internet.
The ALG feature is only needed for traffic that goes through the NBG6818’s NAT.
Figure 48 Settings > Internet > Passthrough