There isn’t much support for per tunnel bandwidth statistics on the ASA.
I would rely on netflow on the IOS router. Export your netflow statistics to a netflow collector and pull reports based on the routers public interface focused on IPSEC traffic destined to the ASA’s public IP address.
NetFlow should help. You can either monitor the tunnel termination interface on the IOS router if it supports NetFlow export or the ASA device itself if it has IOS 8.2 or higher using NetFlow.
If you can let me know the router model or the version on the ASA, I can find out if it supports NetFlow and assist you with the related NetFlow configuration. NetFlow Analyzer from ManageEngine has a free edition which lets you monitor 2 interfaces with no feature limitation on NetFlow reporting.
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.
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