Chapter 4 Broadband
B222s User’s Guide
38
DHCP Option 138 allows the CAPWAP management request (from the AP in managed AP mode) to
reach the AP controller in a different subnet, as shown in the following figure.
Figure 16 CAPWAP and DHCP Option 138
Notes on CAPWAP
This section lists some additional features of ZyXEL’s implementation of the CAPWAP protocol.
• When the AP controller uses its internal Remote Authentication Dial In User Service (RADIUS)
server, managed APs also use the AP controller’s authentication server to authenticate wireless
clients.
• If a managed AP’s link to the AP controller is broken, the managed AP continues to use the
wireless settings with which it was last provided.
4.1.3 Before You Begin
You may need to know your Internet access settings such as LTE APN, WAN IP address and SIM
card’s PIN code if the INTERNET light on your LTE Device is off. Get this information from your
service provider.
4.2 The Broadband Screen
The LTE Device must have a WAN interface to allow users to use the LTE connection to access the
Internet. Use the Broadband screen to view or modify a WAN interface. You can also configure the
LTE Device as part of a Control And Provisioning of Wireless Access Points (CAPWAP) network in this
screen.
SUBNET 1 SUBNET 2
AP
CONTROLLER
MANAGED
AP
DHCP
SERVER
+ OPTION 138
CAPWAP
TRAFFIC
(STATIC IP)
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