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This article will show you how to setup the MAC Address Clone  feature  on a Linksys router in order to send the old router's MAC address to  your ISP, instead of the new one. This article is designed for CCNA  students, network engineers, and anyone looking to use MAC Address Clone  feature on a Linksys wireless router.  
This article falls under the CCNA syllabus's objective "Explain and  select the appropriate administrative tasks required for a WLAN".

A MAC address is 12 figures string that identifies a network  adapter. Therefore, you cannot find two network adapters with the same  MAC address. Most Internet Sevice Providers (ISPs) requires their  clients to supply their usernames and passwords in order to the  Internet. However, some of ISPs require additional information, which is  the router's MAC address (this MAC address must be registered with your  ISP). If you change your router, then the router's MAC address changes.  Therefore, you should register the new router's MAC address with your  ISP.  

However, you can avoid this using the Linksys router because it has a  built-in feature called MAC Address Clone. This feature allows you to  send the old router's MAC address to your ISP, instead of the new one.  Thus, you do not need to re-register the new router's MAC address with  your ISP.

Read the following instructions in order to configure the MAC Address Clone feature:

Step 1: Open your favorite web browser application, and enter the IP address 192.168.1.1 in the address field. Then press Enter.

Step 2: In the authentication dialog box, enter the administrator's  username and password. The default values are admin/admin for the  username/password. However, on some Linksys router platforms, the  default value for the username is the blank and for the password is  admin.

Step 3: Click MAC Address Clone.

Step 4: Click Enable in order to activate the MAC Address Clone feature. Otherwise, click Disable.

Step 5: In the User Defined Entry field, enter the MAC address registered with you ISP.

Step 6: Click Clone Your PC's MAC Address.

Step 7: Click Save Settings.