With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cGgsnExtActivatedv4v6MobileStations
cisco Gateway GPRS Support Node Ext Activatedv4v6 Mobile Stations
1.3.6.1.4.1.9.9.647.1.3.6
This object represents the current number of mobile stations with active IPv4v6 PDP contexts.
Back to CISCO-GGSN-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cGgsnExtActivatedv4v6MobileStations on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.