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Chapter 9 Network
NWA/WAC/WAX Series User’s Guide
96
Note: The AC needs to have a static IP address. If it is a DHCP client, set the DHCP server to
reserve an IP address for the AC.
AC management and IP Subnets
By default, CAPWAP works only between Zyxel Devices with IP addresses in the same subnet.
However, you can configure the Zyxel Device and the AC to use CAPWAP 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 AC on your network.
DHCP Option 138 allows the management request (from the Zyxel Device) to reach the AC in a different
subnet, as shown in the following figure.
Figure 51 CAPWAP and DHCP Option 138
Notes on AC Management
This section lists some additional features of Zyxel’s implementation of the CAPWAP protocol.
• When the AC uses its internal Remote Authentication Dial In User Service (RADIUS) server, managed
Zyxel Devices also use the AC’s authentication server to authenticate wireless clients.
• If an Zyxel Device’s link to the ACis broken, the Zyxel Device continues to use the wireless settings with
which it was last provided.
9.1.2 What You Can Do in this Chapter
• The IP Setting screen (Section 9.2 on page 97) configures the Zyxel Device’s LAN IP address.
• The VLAN screen (Section 9.3 on page 98) configures the Zyxel Device’s VLAN settings.
• The Storm Control screen (Section 9.4 on page 101) turns on or off the traffic storm control feature on
the Zyxel Device.
• The AC Discovery screen (Section 9.5 on page 102) configures the Zyxel Device’s AP Controller (AC)
settings.
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