How you can Set Up Access Control In Your DIR-300 D-Link Wireless Router details the procedures for setting up your DIR-300 wireless router so that only authorized computers are allowed to connect with the router and thereby allow only those computers to access the Internet.
If you are using a D-Link DIR-300 wireless router in your house, here's how to use access control to prevent your neighbors from using your Internet connection for free.
When configuring your wireless router, it is best to use a laptop that is connected physically to the router through one of the router's LAN interface using a CAT-5 LAN cable. This way, you can always connect to the router even if you make a mistake in setting up wireless access to your router.
Gather Wireless Machine Addresses
To complete this procedure you need to first find out the wireless machine address of all the computers that are going to use the wireless connection. You will use this information later in specifying only which computers will be allowed to use your Internet connection.
Getting the wireless machine address of your laptop involves opening a command line window and typing a command to the computer's operating system. To open a command line window in Vista, click the start button, type command on the search box and press your keyboard's enter key. In Windows XP Click the start button and then click run then type command on the run text box.
Use the ipconfig Command
To find out what the machine address of your laptop's wireless adapter, type ipconfig /all on the command line window and the press enter key on your keyboard. Look for the wireless LAN adapter network connection and copy on a piece of paper the data opposite the physical address. This consists of six paired numbers or letters.
If you're using a Mac, click on Finder in your dock, scroll down to Applications, then Utilities and then click the Terminal link. When the terminal window opens, type ifconfig and press enter on your keyboard.
Look for the entry that has an IP address assigned to it together with a subnet mask, and whose status is active. Copy on a piece of paper the numbers and letters opposite the word ether. Make sure that you have copied the numbers correctly and that you have six pairs of letters or numbers.
Check that All Computers can Access Internet
Before configuring access control on your wireless router, make sure that all the wireless computers are able to access the Internet using the wireless router. This is to make sure that any connection problem later on can be easily traced to incorrect wireless machine address.
Of course I am assuming that you already have a working broadband connection and that you are already able to use that connection in wireless mode.
DIR-300 Access Control Setup Page
Configure Access Control on the Router
Log in to you wireless router by typing 192.168.0.1 in your browser’s address bar and hitting your keyboard's enter key. Click the advanced link on top of the page, then click access control on the left hand portion of the advanced page.
Get out your list of machine addresses and type them under the column marked MAC Address on the space provided in the access control configuration page of the router's web-based interface. Make sure that you separate each pair of number or letter with a colon character (:).
Next, put a check mark on the left hand side of each of the machine addresses you have just typed. Then, configure how MAC address filtering is to be done by choosing the option turn MAC filtering and allow computers listed to access the network.
Finally, click on one of the save settings button that you will see on the access control configuration page. That's it, wait for the router to re-initialize and test each computer if they can access the Internet. Check for incorrect machine address if a computer is not able to make a connection to the router.
Troubleshoot and Test
If only one computer is unable to access the Internet, then most probably, its wireless machine address in the router's database is incorrect. If all wireless computers can not access the Internet, then the wrong option was chosen in setting up the machine address filtering configuration.
To test if the filtering is working correctly, choose one laptop and change its wireless machine address to an incorrect one in the MAC filtering configuration page of the router's web-based interface. Save the settings and try using the laptop being tested in accessing the Internet. If that laptop is unable to access the Internet, then the MAC filtering configuration is correct.
Don't Forget the Check Mark
Always remember to make a check mark on the left hand side of each wireless machine address to make sure that subject computer is included or covered by the MAC address filtering rule that you have set up. You will receive a confusing error message from the router if you failed to do this.
I have made this mistake myself and consequently, I was unaware that the router was not filtering machine addresses correctly. I have learned my lesson and so I am teaching you now how this error can be avoided. To be sure, make as many tests as you can so you can rest assured that the security feature is working correctly.
Read an article on using DHCP reservation to minimize unauthorized connections to your DLink DIR-300 wireless router at: http://publishtoweb.blogspot.com/2012/01/use-dhcp-reservation-to-minimize.html.
Read an article on setting up DHCP on your DLink DIR-300 wireless router at: http://publishtoweb.blogspot.com/2011/12/internet-protocol-addressing-for.html.
Read on how you can access your DLink DIR-300 wireless router from the Internet at: http://publishtoweb.blogspot.com/2010/01/how-you-can-access-your-dlink-dir-300.html.
Read an article on Internet Protocol addressing for setting up DHCP on your DLink DIR-300 wireless router at: http://publishtoweb.blogspot.com/2011/12/internet-protocol-addressing-for.html.
Read an article on surfing the Internet faster by using OpenDNS on your DLink DIR-300 wireless router at: http://publishtoweb.blogspot.com/2011/12/surf-internet-faster-by-using-opendns.html.
Read an article on setting up your DLink DIR-300 wireless router for hidden wireless and connecting your Vista laptop to it at: http://publishtoweb.blogspot.com/2010/11/setting-up-your-dlink-dir-300-router_08.html.