Wireless Access

I have a pair of 7220 controllers that are performing local controller functions at a large campus.  Both controllers are configured with name servers and have ip domain lookup enabled.  They also both have the same default route.  However, the secondary controller can resolve DNS correctly (tested via the ping www.cnn.com command) but the primary controller cannot.  When testing using the ping command and a name, I get the following response:

#ping www.cnn.com
Incorrect input! Use 'ping <target-ip-address>'

Any ideas on how to get DNS working?  This is preventing our BLE beacons from talking through the controller correctly.  Thank you.

What version of ArubaOS is this?

How are the beacons involved?

This is 6.4.4.2.

The beacons have a URL in the system profile that currently isn't resolvable as DNS isn't functioning (not as far as I can tell).  In Meridian, I can see the beacons only talk to MEridian through my beacons app, not through the controller.

ip domain lookup could require a controller reboot:

(Aruba7005-US) #configure t
Enter Configuration commands, one per line. End with CNTL/Z

(Aruba7640-US) (config) #ip domain?     
domain                  IP DNS Resolver
domain-name             Define the default domain name

(Aruba7640-US) (config) #ip domain ?
lookup                  Enable IP Domain Name System hostname translation 
                        for clients

(Aruba7640-US) (config) #ip domain lookup 
Operation may not take effect until a reboot

I will try and reboot off hours to see if this resolves.  However, both controllers were configured with the same settings (name-servers and ip domain lookup) and neither were rebooted, yet the secondary resolves successfully and the primary doesn't.  

Again, will reboot and let you know.

How to configure A record of clearpass hostname in controller ?

The main target is to resolve URLs from external DNS like 8.8.8.8 and enable guests to access CPPM Captive portal page (private ip), don't want to allow guests access internal DNS for security concerns.