Billion BiGuard 30, User Manual

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POP3 (port 110). When an incoming access request is received, it will be forwarded
to the corresponding internal server.
Click
Create to add a new port forwarding rule.
This function allows any incoming data addressed to a range of service port
numbers (from the Internet/WAN Port) to be re-directed to a particular LAN
private/internal IP address. This option gives you the ability to handle applications
that use more than one port such as games and audio/video conferencing.