Ethereal-users: [ethereal-users] Sniffing 802.1Q connections

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From: Brian Capouch <brianc@xxxxxxxxxxx>
Date: Mon, 03 Jul 2000 16:22:57 -0500
This is more an informational question unless the behavior I'm about to
describe is identified by a cheese as being a bug.

Just for s & g, I brought up a couple of Linux boxes using VLANS.  I
stuck ethereal on the connection, and it nicely decoded the VLAN tag,
FOR ONE SIDE.

It identified and displayed the VLAN stuff correctly for the side of the
connection that was on the host doing the sniffing, but couldn't see it
(i.e. no 802.1Q stuff anywhere in the packet info) for the other side.

I got the same results whether the connection went through an ethernet
switch or whether it was done on plain ole easily-sniffable coax.

I can't think of an explanation for this, although there surely must be
one. . .

Thanks.

B.