PLANET CS-2001 - Manual (Page 225)

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Chapter 10 Virtual Server
Virtual server provides services to external users by mapping a real IP address
from a WAN port on the CS-2001 to a private IP address within the LAN.
 Mapped IPs: Uses Network Address Translation (NAT) to map a real IP address
to a private IP address (one-to-one mapping) to provide any service (ports
0-65535).
 Port Mapping: Uses Port Address Translation (PAT) to map different services
(ports) of a real IP address to the private IP addresses of internal servers.
Services may also be shared amongst multiple internal servers to provide load
balancing ensuring external service requests with an efficient and uninterrupted
service.
 Virtual IP Group: Provides groupings of Mapped IPs and Port Mapping
settings for convenient application in a policy.