With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rttMonEchoAdminNameServer
Round Trip Time Monitor Echo Admin Name Server
1.3.6.1.4.1.9.9.42.1.2.2.1.12
A string which specifies the ip address of the name-server. This object is applicable to dns probe only.
Back to CISCO-RTTMON-MIB MIB page.
IPHost Network monitor allows you to monitor rttMonEchoAdminNameServer on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.