User manual NETGEAR MR314 Reference Manual

[. . . ] Reference Guide for the Model MR314 Cable/DSL Wireless Router NETGEAR, Inc. 4500 Great America Parkway Santa Clara, CA 95054 USA Phone 1-888-NETGEAR SM-MR314NA-1 July 2001 © 2001 by NETGEAR, Inc. All rights reserved. Trademarks NETGEAR and FirstGear are trademarks Netgear, Inc. Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation. [. . . ] As a minimum security precaution, you should change the ESSID setting of all devices on your network from the factory setting to a unique password. Restricting access by MAC address filtering adds another obstacle against unwanted hosts joining your network. To hinder a determined eavesdropper, you should enable Wired Equivalent Privacy (WEP) data encryption. However, there may be a significant degradation of the data throughput on the wireless link when WEP is enabled. For further information on wireless networking, refer to "Wireless Networking" in Appendix B, "Network and Routing Basics. " Advanced Configuration of the Router 5-9 Reference Guide for the Model MR314 Cable/DSL Wireless Router Configuring for Port Forwarding to Local Servers Although the router causes your entire local network to appear as a single machine to the Internet, you can make local servers for different services (for example, FTP or HTTP) visible and available to the Internet. From the Main Menu of the browser interface, under Advanced, click on PORTS to view the port forwarding screen, shown in Figure 5-4 Figure 5-4. Port Forwarding Menu Requested services are identified by port numbers in an incoming IP packet. For example, a packet that is sent to the external IP address of your router and destined for port number 80 is an HTTP (Web server) request, and port 21 is an FTP request. Examples of port numbers are shown at the top of the PORTS menu, although you are not limited to these choices. See IETF RFC1700, "Assigned Numbers, " for port numbers for common protocols. . Note: Many residential broadband ISP accounts do not allow you to run any server processes (such as a Web or FTP server) from your location. Your ISP may periodically check for servers and may suspend your account if it discovers any active services at your location. If you are unsure, refer to the Acceptable Use Policy of your ISP. 5-10 Advanced Configuration of the Router Reference Guide for the Model MR314 Cable/DSL Wireless Router Use the PORTS menu to configure the router to forward incoming protocols to IP addresses on your local network based on the port number. In addition to servers for specific protocols, you can also specify a Default (also called DMZ) Server to which all other incoming protocols are forwarded. To specify a range of ports, enter the last port to be forwarded in the End Port box. Enter the IP address of the local server in the corresponding Server IP Address box. Click Apply at the bottom of the menu. Local Web and FTP Server Example If a local PC, with a private address of 192. 168. 0. 33, acts as a Web and FTP server, configure the PORTS menu to forward ports 80 (HTTP) and 21 (FTP) to local address 192. 168. 0. 33 as shown in Table 5-5. Table 5-5. Port # Default 80 (HTTP) 21 (FTP) Port Table Entries (Example) Server IP Address 0. 0. 0. 0 192. 168. 0. 33 192. 168. 0. 33 In order for a remote user to access this server from the Internet, the remote user must know the IP address that has been assigned by your ISP. If this address is 172. 16. 1. 23, for example, an Internet user can access your Web server by directing the browser to http://172. 16. 1. 23. The assigned IP address can be found in the Maintenance Status Menu, where it is shown as the WAN IP Address. Some considerations for this application are: · · If your account's IP address is assigned dynamically by your ISP, the IP address may change periodically as the DHCP lease expires. If the IP address of the local PC is assigned by DHCP, it may change when the PC is rebooted. To avoid this, change the configuration of your PCs to use fixed private addresses rather than DHCP-assigned addresses. Advanced Configuration of the Router 5-11 Reference Guide for the Model MR314 Cable/DSL Wireless Router · Local PCs must access the local server using the PCs' local LAN address (192. 168. 0. 33 in this example). Attempts by local PCs to access the server using the external IP address (172. 16. 1. 23 in this example) will fail. Local Game Host or Videoconference Example Some online games and videoconferencing applications are incompatible with NAT. The Model MR314 router is programmed to recognize some of these applications and to work properly with them, but there are other applications that may not function well. [. . . ] A communications network serving users within a limited area, such as one floor of a building. A LAN typically connects multiple personal computers and shared network devices such as storage and printers. Although many technologies exist to implement a LAN, Ethernet is the most common for connecting personal computers. The portion of a number, address, or field that is farthest left when written as a single number in conventional hexadecimal ordinary notation. [. . . ]