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Chapter 11. System Management RX3141 User’s Manual
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Figure 10.2 Reverse NAPT – Relayed Incoming Packets to the Internal Host Base on the Protocol, Port
Number or IP Address
10.1.2 Reverse NAPT / Virtual Server
Reverse NAPT is also called inbound mapping, port mapping, or virtual server. Any packet coming to the
RX3141 can be relayed to the internal host based on the protocol, port number and/or IP address specified in
the ACL rule. This is useful when multiple services are hosted on different internal hosts. Figure 10.2 shows
that web server (TCP/80) is hosted on PC A, telnet server (TCP/23) on PC B, DNS server (UDP/53) on PC C
and FTP server (TCP/21) on PC D. This means that the inbound traffic of these four services will be directed to
respective host hosting these services.
10.2 Configure Virtual Server
Virtual server allows you to configure up to ten public servers, such as a Web, E-mail, FTP server and etc.
accessible by external users of the Internet. Each service is provided by a dedicated server configured with a
fixed IP Address. Although the internal service addresses are not directly accessible to the external users, the
router is able to identify the service requested by the service port number and redirects the request to the
appropriate internal server.
Note
RX3141 supports only one server of any particular type at a time.
10.2.1 Virtual Server Configuration Parameters
Table 10.1 describes the configuration parameters available for virtual server configuration.