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5.8 Virtual Server
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 CS-2000'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 provides 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 CS-2000'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 CS-2000
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 function 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 transferred 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 CS-2000's external real IP address, then map to the internal private IP address via the
CS-2000 appliance. That means the external real IP address mapped to the LAN private IP address.
Server 1/2/3/4 Interface：
It is almost the same as the IP mapped function. The difference is that the virtual server use the one to many
IP mapped. That means one real IP address mapped to 1~4 LAN private IP address. The virtual server also
provides the service items as the same in the Service function.
CS-2000 UTM Content Security Gateway User's Manual
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