BEFSR41 User Guide is the installation guide of Linksys Etherfast® Cable/DSL Router with 4-Port Switch
This guide introduces the Linksys BEFSR41 EtherFast Cable/DSL Router, describing its built‑in 4‑port switch, LAN and Internet ports, and key features such as Universal Plug‑and‑Play, IPSec/PPTP pass‑through, and parental controls. It explains basic networking concepts, IP addressing, and how the router connects a home or small‑office network to the Internet.
The manual walks you through hardware installation, connecting the modem and PCs, configuring the router via its web‑based utility, and setting up DHCP, static IP, or PPPoE as required by your ISP. It also covers advanced settings, firmware upgrades, troubleshooting common problems, and provides warranty and contact information.