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Wireless & Mobility · Intermediate

DHCP Option 43

A vendor-specific DHCP option used to give APs the IP address of their wireless controller.

Definition

For Cisco APs, option 43 is typically formatted as TLV type 0xF1 followed by the length and controller IP addresses in hex. The DHCP server must recognize the AP vendor class identifier (option 60) in some configurations. It is the most common Layer 3 discovery method.

Example

Option 43 hex f104c0a80a05 points to WLC 192.168.10.5.

Exam tip

Option 43 = vendor-specific; TLV type f1 for Cisco CAPWAP.

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