Following method has worked every time I have tried. Here is how to setup the wireless:
This instruction is to setup Brother Laser printer 2170W in LinuxMint, Ubuntu or Windows 7.
Part 1: To reset the printer & establish a wireless connection between a Printer & a router
Turn off the printer.
Press and hold the Go Button in front, at the same time turn on the printer from the right side. You will see three lights (Error, Drum, Toner) turn on. Release the Go button. The light is not blue and is off.
Now,
Press the Go button 7 times. Wait for some seconds.
The three lights will turn on and off by themselves. The printer warms up and then stops.
Connect the ethernet cable to the wireless router and the printer
In the browser type:
http://192.168.2.1 [[Or your router's IP address]]
Confirm that your printer is on network listed in the DHCP client list.
Now, in your internet browser type in IP ADDRESS of your PRINTER.
Network configuration ---
Configure wireless Make sure
Communication Mode is Infrastructure
Wireless Network Name (SSID) -----
Browse------
Select your Wireless Network.
Channel is same as
your network's channel number.
Authentization Method should be WPA/WPA2-PSK (or
the authentication method of your network)
Encryption method Choose same Encryption as
your network's encryption method.
Network Key <do not change anything>
Passphrase : <Enter your network passphrase>
User ID and Password: <Leave them blank>
Submit.
Now wait until you get instruction in the browser:
“If the Ethernet cable is connected to this machine, please remove it.”
Disconnect your Network cable from the Printer.
Your Printer will print two pages. 2nd page will describe Wireless settings.
Confirm that the setup is successful.
Part 2: Configuring Printer to have a STATIC IP address (So, you do not have to add a printer in UBUNTU---SYSTEM---ADMINISTRATION---PRINTING every time you restart your router or printer):
In your web browser open
http://192.168.2.1 (or
your router's IP address)
Find the list of DHCP clients. (You will find your Printer's NEW IP address here.)
In your web browser
open Your Printer's NEW IP address while it is connected wirelessly. For me it is
http://192.168.2.5
Network Settings ----
User: admin Password: access ----
Configure TCP/IP ----
IP Address: 192.168.2.199 (Note that last 3 number should be kept on higher side, so it does not conflict with your Network's DHCP fuctions. Most likely it is not going to be a problem.)
And,
BOOT METHOD : STATIC. [[If you leave this DHCP, your printer's IP address will change at every reboot of your printer, requiring UBUNTU to DETECT & ADD the printer at every restart of the printer.]]
Part-3: Defining the Printer's NODE NAME to more human-readable name:
In your browser, go your printer's IP address.
Log in.
Network Configuration ---- Wireless ---- click on Node Name.
Update Node Name to Brother-HL2170-wireless (up to your preference).
Network Configuration ---- Wired ---- click on Node Name.
Update Node Name to Brother-HL2170-wired (up to your preference).
RESTART YOUR PRINTER.
SUBMIT.
Part-4: Add Printer in UBUNTU System
Ubuntu ----- START ----- SYSTEM ---- ADMINISTRATION ---- PRINTING.
ADD --- PRINTER ---- NETWORK PRINTER ---- Wait 30 seconds for the system to detect the printer automatically. If printer is not found automatically, type in IP address of the printer and probe for it.
Select Your Printer. Selecting JETDIRECT (PRINTER'S IP ADDRESS) works for me.
FORWARD
You may change the name of the printer if you wish.
APPLY.
Print TEST PAGE.
DONE.
ENJOY.

Credit mainly to: "Difficult to setup the wireless connection" on June 24, 2010 by zionlionboy on Cnet.com
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