Wireshark does not display VLAN tags on my Windows 7 - 64 bit Dell box with a I340-T4 NIC running 22.214.171.124 drivers.
I have added "MonitorMode" = "2" to the registry and rebooted. But vlan tags still do not show up in wireshark.
On the same box I have a loaner Broadcom NIC with "PreserveVlanInfoInRxPacket" = "1" in registry, on this one it works!
I span one source port (trunk) on a Cisco switch to both (destination ports) the intel and the broadcom NIC so i'am 100% sure input is correct.
Have anyone got "MonitorMode" working on Winodws7 / I340-T4?
I have exactly the same problem.
Using a Intel® PRO/1000 GT under Windows XP with the registry setting from http://www.intel.com/support/network/sb/cs-005897.htm works.
Under Windows 7 64 I cannot manage to make it work.
I also found this one: http://communities.intel.com/message/127879#127879 to set the MonitorMode to 2, which I will try now. But it is not really documented somewhere.
So if you could solve the problem, please let me know!