cvpdnTunnelAttrTunnelId 1.3.6.1.4.1.9.10.24.1.2.2.1.1

The Tunnel ID of an active VPDN tunnel. If this end is the instigator of the tunnel, the ID is the TS tunnel ID, otherwise it is the NAS tunnel ID. Two distinct tunnels with the same tunnel ID may exist, but with different tunnel types.