Hey everyone,

As you know, Windows strips the VLAN tagging on each packet as it exits your laptop NIC card. I Googled and found something on Wireshark's website, but it didn't work. So I emailed Marvell's tech support and they promptly got back to me with a solution. I tried this solution on my Marvell Yukon 88E8039 PCI-E Fast Ethernet Controller NIC card and it works like a charm! I can now connect my laptop with GNS3 to a real Cisco switch and do trunking! Here's the steps (with attachment at the bottom):

1) Go to Start and type 'regedit' in the search (or select Run if you have XP)

2) Navigate to HKEY_LOCAL_MACHINE >> SYSTEM >> CurrentControlSet >> Control >> Class >> {4D36E972-E325-11CE-BFC1-08002BE10318} >> 00XX (where XX is the number your NIC card is listed, you'll have to check each one)

3) Create a new DWORD (32-Bit) with a name of *PriorityVLANTag (including the star) and a value of 0 (Hexadecimal)

4) Reboot your computer.

I have only tried this on my Marvell NIC card, so if anyone else has a different model, try this solution out and post it to see if it works on all Marvell Yukon NICs.

Hope this helps,

Neocec

Thanks Neocec

Worked like a charm

I am using Marvell Yukon 88E8040 PCI-E Fast Ethernet Controller with Windows Vista. It is possible to configure tagged VLAN with VLAN Trunk Mode and Link Aggregation on this NIC in case of installation of ver 11.30.1.3 driver and Marvell Network Configuration Utility ver 11.12.6.3 . To see VLAN tags in Wireshark ver 1.8.6 or other sniffer create DWORD item SkDisableVlanStrip and set it to "1" in HKEY_LOCAL_MACHINE >> SYSTEM >> CurrentControlSet >> Control >> Class >> {4D36E972-E325-11CE-BFC1-08002BE10318} >> 00XX (XX is catalog of Marvell 88E8040 adapter). After reboot you can see tagged VLAN Ethernet frames in logs of Wireshark in case of ICMP ping from switch, for example . It looks like for configuration of IEEE802.1p QoS it needs to change "*PriorityVLANTag" value

To enable Jumbo Frames don't change *JumboPacket from 0 to 1 or 2 in HKEY_LOCAL_MACHINE >> SYSTEM >> CurrentControlSet >> Control >> Class >> {4D36E972-E325-11CE-BFC1-08002BE10318} >> 00XX . Just input "netsh interface ipv4 show subinterfaces
" to see name of LAN and "netsh interface ipv4 set subinterface "Name of your LAN" mtu=1550 store=persistent" in cmd with administrator privilege and disable TCP/IP packets segmentation by NIC instead of system CPU settings in NIC Property Settings > Avdanced (It is enabled by default for resource optimization).

That's a great tip Kolbasov! Thanks for sharing!

I would also like to add that this method also works for the ASIX AX88772 chipset which is found in the Rocket Fish Wii LAN adapters and other devices.

Note: The *PriorityVLANTag DWORD already exists. All you need to do is change the default value of 1 to 0 and reboot your PC.


Enjoy!