Planet BM-2101, User Manual

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１６７
Chapter 12
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When the MIS engineer apply the network connection from the ISP provider , the
provided real IP is usually not enough to give to all the users . Normally , the MIS
engineer can use the private IP address transfer to the real IP address via the BM-2101’s
NAT (Network Address Translation) function , in order to give the sufficient IP address
to every user . If the MIS engineer set the server which provide the external service in
LAN , then the external user can not link to the internal private IP address .
According to this problem , the MIS engineer can use the BM-2101 ‘s virtual
server function to solve the problem . The so called virtual server is to map the real IP
address to the private IP address via the BM-2101 appliance.
The virtual server also includes the features , called One to Many map function. It
means one real IP address can map to the private IP address in four LAN servers which
provide the same service . It is because the virtual server can provide the Load Balance
function which can provide the proper bandwidth to the LAN server group depends on
the sessions . In other words , the functin can reduce the problem of System Crash and
bandwidth distribution , to make the server can work more efficiently .
In this Chapter , we will make the introduction of Mapped IP and Server 1/2/3/4 .
Mapped IP
：
The LAN IP address is a kind of private IP address which is
transffered via the NAT ( Network Address Translation ) . So the external user can not
directly link to the private IP address . In other words , the external user has to link the
BM-2101’s external real IP address, then map to the internal private IP address via the
BM-2101 appliance . That means the external real IP address mapped to the LAN
private IP address.