With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cgdSourceAddressAddress
Cisco Global Server Load Balancer DNS Source Address Address
1.3.6.1.4.1.9.9.595.1.7.2.1.3
This object specifies the source address subnet IP address to match incoming client requests.
Back to CISCO-GSLB-DNS-MIB MIB page.
IPHost Network monitor allows you to monitor cgdSourceAddressAddress 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.