Chapter 4 Broadband
B222s User’s Guide
37
2 The AP sends out a discovery request, looking for an AP in CAPWAP AP controller mode.
3 If there is an AP controller on the network, it receives the discovery request. If the AP controller is
in Manual mode it adds the details of the AP to its Unmanaged Access Points list, and you
decide which available APs to manage. If the AP is in Always Accept mode, it automatically adds
the AP to its Managed Access Points list and provides the managed AP with default configuration
information, as well as securely transmitting the DTLS pre-shared key. The managed AP is ready for
association with wireless clients.
Managed AP Finds the Controller
A managed LTE Device can find the controller in one of the following ways:
• Manually specify the controller’s IP address using the commands. See the LTE Device CLI
Reference Guide for details.
• Get the controller’s IP address from a DHCP server with the controller’s IP address configured as
option 138.
• Broadcasting to discover the controller within the broadcast domain.
The AP controller must have a static IP address; it cannot be a DHCP client.
CAPWAP and IP Subnets
By default, CAPWAP works only between devices with IP addresses in the same subnet (see the
appendices for information on IP addresses and subnetting).
However, you can configure CAPWAP to operate between devices with IP addresses in different
subnets by doing the following.
• Activate DHCP. Your network’s DHCP server must support option 138 defined in RFC 5415.
• Configure DHCP option 138 with the IP address of the CAPWAP AP controller on your network.
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