ZyXEL P-202H User Guide - Page 70
Default Server IP Address, Port Forwarding: Services and Port Numbers, Configuring Servers Behind
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P-202H Plus v2 User's Guide 6.4.1 Default Server IP Address In addition to the servers for specified services, NAT supports a default server IP address. A default server receives packets from ports that are not specified in this screen. Note: If you do not assign an IP address in Server Set 1 (default server), the ZyXEL Device discards all packets received for ports that are not specified here or in the remote management setup. 6.4.2 Port Forwarding: Services and Port Numbers Use the NAT - Edit SUA/NAT Server Set screen to forward incoming service requests to the server(s) on your local network. The most often used port numbers are shown in the following table. Please refer to RFC 1700 for further information about port numbers. Table 12 Services and Port Numbers SERVICES ECHO FTP (File Transfer Protocol) SMTP (Simple Mail Transfer Protocol) DNS (Domain Name System) Finger HTTP (Hyper Text Transfer protocol or WWW, Web) POP3 (Post Office Protocol) NNTP (Network News Transport Protocol) SNMP (Simple Network Management Protocol) SNMP trap PPTP (Point-to-Point Tunneling Protocol) PORT NUMBER 7 21 25 53 79 80 110 119 161 162 1723 6.4.3 Configuring Servers Behind NAT (Example) Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the example), port 80 to another (B in the example) and assign a default server IP address of 192.168.1.35 to a third (C in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address. The NAT network appears as a single host on the Internet. 69 Chapter 6 Network Address Translation (NAT) Screens