SMC Networks SMCBR21VPN - Manual (Page 120)

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In this chapter, we will have detailed introduction and instruction of Mapped IP
and Server 1/2/3/4:
Mapped IP: Because the Intranet is transferring the private IP by NAT Mode
(Network Address Translation). And if the server is in LAN, its IP Address is
belonging to Private IP Address. Then the external users cannot connect to its
private IP Address directly. The user must connect to the SMC BR21VPN’s WAN
subnet’s Real IP and then map Real IP to Private IP of LAN by the SMC
BR21VPN. It is a one-to-one mapping. That is, to map all the service of one
WAN Real IP Address to one LAN Private IP Address.
Server 1/2/3/4: Its function resembles Mapped IP’s. But the Virtual Server maps
one to many. That is, to map a Real IP Address to 1~4 LAN Private IP Address
and provide the service item in Service.