This read-only Counter32, in bytes, counts the total number of input bytes received through the VPDN tunnel, and this object is noted as superseded by the 64-bit cvpdnTunnelBytesIn64 for high-throughput tunnels. Administrators use it for inbound bandwidth tracking, while being aware that this 32-bit counter can wrap on tunnels with sufficiently high sustained throughput. For example, an admin building long-term bandwidth trend reports for high-traffic tunnels should use cvpdnTunnelBytesIn64 instead of this object to avoid counter-wrap artifacts in the data.