VPNTTG uses the Simple Network Management Protocol (SNMP) to send requests to a device such as Cisco ASA 5500 Series Adaptive Security Appliances or to similar VPN concentrator. The device must be SNMP enabled. VPNTTG stores monitoring data into the SQL server and into the RRD (Round Robin Database) file for each VPN tunnel as well. VPNTTG has web based intuitive graphical user interface in order to select and/or search interesting VPN tunnel and see incoming/outgoing bandwidth traffic on a daily, weekly, monthly and yearly basis.

Advantage of VPNTTG over other SNMP based monitoring software’s is following: Other (commonly used) software’s are working with static OID numbers, i.e. whenever tunnel disconnects and reconnects, it gets assigned a new OID number. This means that the historical data, gathered on the connection, is lost each time. However, VPNTTG works with VPN peer’s IP address and it stores for each VPN tunnel historical monitoring data into the SQL server and into the RRD (Round Robin Database) file.