What is Option 66?

Option 66 is a feature available in most commercial grade routers which enables offering a 'provisioning server address' to any device on the same LAN and obtaining an IP via DHCP. This method of "broadcasting" the server address to multiple IP phones during the network boot up, versus configuring each one individually, significantly reduces the time and labor needed for most multi device installations.

Enabling Option 66 on a Mikrotik.

*Router must be acting as a DHCP server.

1. Select IP from the main menu.
2. Click on DHCP Server.
   
   
3. From the DHCP Server window, select the Options tab.
4. Click on the "+" (plus sign) to add an Option.
   
   
5. From the DHCP Option's window add the following:
   1. Name of Option (use to identify the Option)
   2. Code: 66 
   3. Value: '<enter-URL-needed-for-specific-device-model> ' (use single quotation)
6. Click OK or Apply.
   
   
7. Review the Option added.
8. Click on the Networks tab.
   
   
9. Double click on the Network (for this example we are working with the default configuration).
10. Select the DHCP Option (created in step 5).
11. Click OK or Apply.
    
    

Now when you plugin an IP device on the same network (LAN) as the Mikrotik, and it obtains an IP via DHCP, the router will redirect the phone to the provisioning server to check for new or updated configuration files.