Chapter 11. System Management

RX3141 User’s Manual

Figure 10.2 Reverse NAPT – Relayed Incoming Packets to the Internal Host Base on the Protocol, Port

Number or IP Address10.1.2 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.

RX3141 supports only one server of any particular type at a time.

Note

10.2.1 Virtual Server Configuration Parameters

Table 10.1 describes the configuration parameters available for virtual server configuration.

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