Option 43 for iPhone
Option 43 is designed to assist wireless network engineer's configuring the DHCP server option 43 and option 60, which are used in deploying various wireless Lightweight Access Points (LWAP).
Option 43 calculates the type-length-value (TLV) for the Lightweight Access Point.
DHCP server option 43 enables the LAPs to discover the wireless LAN controller or controllers.
DHCP servers are configured with the wireless LAN controller IP addresses in order for the access points to join the controller. Option 43 is defined in each DHCP pool or scope.