With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cDnsServConfigUpTime
Cisco Dns Server Config Up Time
1.3.6.1.4.1.9.9.405.1.1.3
If the server has a persistent state (e.g., a process), this value will be the time elapsed since it started. For software without persistent state, this value will be zero.
Back to CISCO-DNS-SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor cDnsServConfigUpTime on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.