Port Range Forwarding

Instant BroadbandTM Series

•Telnet A terminal emulation protocol commonly used on the Internet and TCP/IP-based networks. It allows a user at a terminal or computer to log on to a remote device and run a program.

•SMTP (Simple Mail Transfer Protocol) The standard e-mail protocol on the Internet. It is a TCP/IP protocol that defines the message format and the message transfer agent (MTA), which stores and forwards the mail.

•DNS (Domain Name System) The way that Internet domain names are located and translated into IP addresses. A domain name is a meaningful and easy-to-remember “handle” for an Internet address.

•TFTP (Trivial File Transfer Protocol) A version of the TCP/IP FTP proto- col that has no directory or password capability.

•Finger A UNIX command widely used on the Internet to find out informa- tion about a particular user, such as telephone number, whether currently logged on or the last time logged on. The person being “fingered” must have placed his or her profile on the system. Fingering requires entering the full user@domain address.

•HTTP (HyperText Transport Protocol) The communications protocol used to connect to servers on the World Wide Web. Its primary function is to establish a connection with a Web server and transmit HTML pages to the client browser.

•POP3 (Post Office Protocol 3) A standard mail server commonly used on the Internet. It provides a message store that holds incoming e-mail until users log on and download it. POP3 is a simple system with little selectivity. All pending messages and attachments are downloaded at the same time. POP3 uses the SMTP messaging protocol.

•NNTP (Network News Transfer Protocol) The protocol used to connect to Usenet groups on the Internet. Usenet newsreaders support the NNTP pro- tocol.

•SNMP (Simple Network Management Protocol) A widely used network monitoring and control protocol. Data is passed from SNMP agents, which are hardware and/or software processes reporting activity in each network device (hub, router, bridge, etc.) to the workstation console used to oversee the network. The agents return information contained in a MIB (Management Information Base), which is a data structure that defines what is obtainable from the device and what can be controlled (turned off, on, etc.).

You must check the Enable box to enable the applications you have defined.

EtherFast® Cable/DSL Wireless-Ready Router with 4-Port Switch

To add a customized application in the UPnP Forwarding screen:

1.Enter the name of the application in the appropriate Customized Applications field. Continue with the fields on the same line.

2.In the Ext. Port field, enter the number of the external port used by the server.

3.Check Protocol TCP or Protocol UDP, depending on which protocol you use.

4.Enter the number of the internal port.

5.Enter the IP address of the server that you want the Internet users to access. Refer to your software documentation for more information about chang- ing service port settings, if necessary.

6.Now, check the Enable box or the changes that you made to UPnP Forwarding will not function.

Forwarding is generally used to set up a web server, ftp server, or e-mail serv- er on your network. The router’s DHCP function must be disabled to use Forwarding.

Click the View Port Range Forwarding button to open the Port Range Forwarding screen. (See Figure 6-14.) Port forwarding sets up public services on your network. When users from the Internet make certain requests of your network, the router will forward those requests to the appropriate computer.

BEFSR41W specifications

The Linksys BEFSR41W is a versatile wireless broadband router that has been a popular choice for both home and small office environments since its introduction. Designed to offer reliable internet connectivity, the BEFSR41W combines wired and wireless capabilities, ensuring that users can connect multiple devices efficiently.

One of the standout features of the Linksys BEFSR41W is its integrated 4-port 10/100 Ethernet switch, which allows users to connect their wired devices directly. This is particularly useful for users who require stable connections for activities such as gaming or streaming high-definition content. The router supports the IEEE 802.3 and 802.3u standards, ensuring compatibility with a wide range of devices.

In terms of wireless capabilities, the BEFSR41W operates on the 802.11b and 802.11g standards, providing maximum wireless data rates of up to 54 Mbps. This enables users to experience reasonably fast wireless internet speeds for everyday online activities such as browsing and emailing. The router's built-in antenna offers decent coverage, making it suitable for smaller homes and office spaces.

Security is a key consideration for any network device, and the Linksys BEFSR41W incorporates several features to help safeguard users' data. It supports Wired Equivalent Privacy (WEP) and Wi-Fi Protected Access (WPA) encryption methods, allowing users to set up secure connections and protect sensitive information from unauthorized access. Additionally, the router includes a built-in firewall to help prevent external attacks and threats.

Another significant characteristic of the BEFSR41W is its easy setup process. The router comes with a user-friendly web-based interface that simplifies the configuration process. Users can easily set up their network, configure security settings, and manage connected devices without needing specialized technical skills.

Additionally, the router is designed for longevity, with robust build quality ensuring reliability over time. It is also backward compatible with older wireless standards, which provides flexibility for users who have legacy devices in their network.

In conclusion, the Linksys BEFSR41W is a solid option for anyone seeking a dependable routing solution that balances both wired and wireless connectivity. With its blend of features, ease of use, and security options, it remains a relevant choice for users looking to establish a basic home or small office network.