BEFSR41 v3.1
EtherFast Cable/DSL Router with 4-Port Switch

The Linksys BEFSR41 v3.1 router has No WiFi, 4 100mbps ETH-ports and 0 USB-ports.
It is also known as the Linksys EtherFast Cable/DSL Router with 4-Port Switch.

Quick links:
Default password/Login

BEFSR41 v3.1 router specifications (specs)

System specs
CPU: 166 MHz
RAM: 2 MiB
Flash: 1 MiB
Custom firmwares: None

Connectivity
WiFi: No ()
WiFi bands: n/a
WiFi throughput: n/a
WAN: 1 x 100mbps port
ETH: 4 x 100mbps ports
USB-ports: 0

Hard reset instructions for Linksys BEFSR41 v3.1

If your BEFSR41 v3.1 router is not working as it should, dropping connections or not being responsive, you should first do a reset of the router to see if the problems persist. Other scenarios where you might want to reset your router is if you've forgotten the password or misconfigured it and can't get access anymore.
Your can reset your Linksys BEFSR41 v3.1 in the following way(s):

Through the web interface

Open your browser and navigate to the router interface (check default settings below)
Under the Administration tab you will find a sub-tab called Factory defaults
On the Factory defaults page click the button labeled Restore Factory Defaults

With the reset button

Have your unit powered on
Press and hold the reset button for at least 10 seconds until the power light starts blinking, then release.
When the power light goes solid, unplug the power to the router for 10 seconds
Plug the power back in and start the router
When the power light goes solid again the router is ready to use.

The 30-30-30 reset

If the above instructions don't work you can always try the 30-30-30 reset as follows:

When router is powered on, press the reset button and hold for 30 seconds. (Use a paper clip or something sharp)
While holding the reset button pressed, unplug the power of the router and hold the reset button for 30 seconds
While still holding the reset button down, turn on the power to the unit again and hold for another 30 seconds.

This process usually works for resetting any router to it's factory setting.

Note: It is worth reading more about how to reset routers with the 30 30 30 reset and what the risks and considerations are when resetting your router this way, instead of just rebooting it.

Default factory settings for Linksys BEFSR41 v3.1

If you have performed a reset of your BEFSR41 v3.1 device or not changed the defaults, you should be able to access it with the following settings:

Default subnet mask: 255.255.255.0

Note: If you are using the default settings you should change them to increase security and prevent unathorized access to your network.