Xirrus Wi-Fi Array XN16 User Manual page 228

Virtual Tunnel Server (VTS)
Tunneling capability is provided by a Virtual Tunnel Server. You supply the server
and deploy it in your network using open-source VTun software, available from
vtun.sourceforge.net. To enable the Array to use tunneling for a VLAN, simply
enter the IP address, port and secret for the tunnel server as described in
on page 208.
VTun may be configured for a number of different tunnel types, protocols, and
encryption types. For use with Arrays, we recommend the following
configuration choices:
z
Tunnel Type: Ether (Ethernet tunnel)
z
Protocol: UDP
z
Encryption Type: select one of the encryption types supported by VTun
(AES and Blowfish options are available)
z
Keepalive: yes
Client-Server Interaction
The Array is a client of the Virtual Tunnel Server. When you specify a VTS for a an
active VLAN-SSID pair, the Array contacts the VTS. The server then creates a
tunnel session to the Array. VTun encapsulated packets will cross the Layer 3
network from the Array to the VTS. When packets arrive at the VTS, they will be
de-encapsulated and the resultant packets will be passed to your switch with
802.1q VLAN tags for final Layer 2 processing. The process occurs in reverse for
packets traveling in the other direction.
We recommend that you enable the VTun keep-alive option. This will send a
keep-alive packet once per second to ensure that the tunnel remains active.
Tunnels can be configured to come up on demand but this is a poor choice for
Wi-Fi, since tunnel setup can take roughly 5-20 seconds and present a problem for
authentication.
206
Wi-Fi Array
Step 10
Configuring the Wi-Fi Array