AirLive WH-5420CPE - Manual (Page 49)

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 Virtual Server: You can use Virtual Server Settings to provide connection on internet.
For example, you can have your own web server at home and provide access on
internet. This will need port 80 by default for Virtual Server Settings.
 Special Application: This is to enable internet service such as sound, video and so on.
The routing firewall often stops these services for security reason.