ZyXEL Communications NBG7815, Руководство пользователя

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Chapter 9 WAN
NBG7815 User’s Guide
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The following table describes the labels in this screen.
9.6 Passthrough
Use this screen to change your NBG7815’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
NBG7815’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 NBG7815’s NAT.
Table 30 Add Port Forwarding Rule
LABEL DESCRIPTION
Service Name Select a pre-defined service from the drop-down list box. The pre-defined service
port numbers and protocol will be displayed in the port forwarding summary table.
Otherwise, select
User-Define to manually enter the port number/range and select
the Protocol .
Protocol Select the transport layer protocol supported by this virtual server. Choices are TCP ,
UDP , or TCP_UDP .
If you have chosen a pre-defined service in the Service Name field, the protocol will
be configured automatically.
External Port This shows the port number used to connect to this service using the router's external
IP address on the WAN.
If you select User-Define in the Service Name field, enter the port numbers manually.
Device List Select the internal IP address of the virtual server.
Internal Port This shows the port number used to connect to this service using the server's internal
IP address on the LAN.
If you select User-Define in the Service Name field, enter an internal port number
manually or leave the field blank for port range forwarding.
APPLY Click APPLY to save your changes.
CANCEL Click CANCEL to exit this screen without saving.