Книга: Fedora™ Unleashed, 2008 edition

Configuring DSL Access

Configuring DSL Access

Fedora also supports the use of a DSL service. Although it refers to the different types of DSL available as xDSL, that name includes ADSL, IDSL, SDSL, and other flavors of DSL service; they can all be configured with the Internet Connection Wizard. DSL service generally provides 128Kbps to 24Mbps transfer speeds and transmits data over copper tele phone lines from a central office to individual subscriber sites (such as your home). Many DSL services provide asymmetric speeds with download speed greater than upload speeds.

NOTE

DSL service is an "always-on" type of Internet service, although you can turn off the connection under Fedora by using the Network Device Control, found under System, Administration. An always-on connection exposes your computer to malicious abuse from crackers who trawl the Internet attempting to gain access to other computer systems. In addition to the capability to turn off such connections, Fedora provides a firewall to keep crackers out; you configured a simple firewall during the original installation. The firewall can also be configured from the Security Level Configuration tool found in the System Settings menu selection as Security Level.

A DSL connection requires that you have an ethernet network interface card (sometimes a USB interface that is not easily supported in Linux) in your computer or notebook. Many users also configure a gateway, firewall, or other computer with at least two network inter face cards to share a connection with a LAN. We looked at the hardware and protocol issues earlier in this chapter. Advanced configuration of a firewall or router, other than what was addressed during your initial installation of Fedora, is beyond the scope of this book.

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