Hub? First off, many modern hubs aren't really hubs in the traditional
sense. They are switches. Beware. You'll see one packet go by and
then that's it. The MAC address is stored and you'll see no more. :)
Some hubs/switches will drop VLAN-tagged frames because they don't
understand the tag (which appears as a bogus type field to a
non-VLAN-aware device). I have, however, seen small NetGear gigabit
switches that will pass tagged packets even though they are not VLAN-aware.
If the packets are traversing the hub properly and you're not seeing
them, then there are several possibilites:
- the hub is acting like a switch and therefore not sending the tagged
frames to the port your PC is connected to
- Windows pcap isn't in promiscuous mode
- the Windows driver is dropping the frames because of the tag
Or it may be none of these....
I know the Intel PRO is VLAN capable but I'm not sure about Windows, and
even if you do get the packets, you may not see the tags. See
http://wiki.ethereal.com/CaptureSetup_2fVLAN for more info.
I'll update the Linux section...
somasundaram selvaraj wrote:
Hi
I have a windows 2000 pro wih intel pro 1000 MT adapter.
I am trying to capture the vlan packets and i am not able to
capture that. Basically I have two switches configured for vlan 100
and two trunk ports on both the switch.
I ve connected a hub to one of the trunk port.one port of the hub
is connected to a pc which can read 802.1q information.But etherpeek
is not able to capture the vlan packets.
I am able to ping between the switches.
Can u assist me in fixing the issue.
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