AirLive RS-1000 - Manual (Page 126)

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" Virtual Server can map one real IP to several LAN physical servers while
Mapped IP can only map one real IP to one LAN physical server (1-to-1
Mapping). The Virtual Servers’ load balance feature can map a specific
service request to different physical servers running the same services.
" Virtual Server can only map one real IP to one service/port of the LAN
physical servers while Mapped IP maps one real IP to all the services offered
by the physical server.
" IP mapping and Virtual Server work by binding the IP address of the WAN
virtual server to the private LAN IP address of the physical server that
supports the services. Therefore users from the WAN network can access
servers of the LAN network by requesting the service from the IP address
provided by Virtual Server.