Bytes sent and bytes received are not reported or are incorrect after configuring Virtual LANs

VLAN Statistical data may not be present or reported correctly for some of the categories within Task Manager and Network Connection properties of your virtual LANs.

Sometimes this is seen in the bytes sent or bytes received statistics where byte counters:

• Remain at zero
• Or are exactly the same for all virtual networks
• Or are exactly the same for all virtual networks and your physical network adapter

This may be the case even though traffic is correctly being transmitted and received over the virtual network.

Your network adapter miniport drivers are not collecting statistical data for network traffic on VLANs and presenting it to the OS. You are more likely to see these symptoms on a network adapter where the TCP Offload Engine (TOE) is being used to improve data transfer performance by offloading TCP/IP traffic to the network adapter hardware.

Your network adapter vendor may not support reporting virtual network statistics, please check their documentation.

For more information on Network Devices, see the Windows Driver Kit documentation on the subject. As a query, NDIS and overlying drivers use the OID_GEN_STATISTICS OID to obtain statistics of an adapter or a miniport driver.