> Is there anybody knows how capture collision-frame passing through the
> ether-card?
If by that you mean that, when a collision occurs, you want to see what
frame collided with the frame that the Ethernet card was transmitting,
you'd first have to find an Ethernet card that can receive packets that
collide with frames that they're transmitting - and I don't know whether
it's even *possible* for that to work.
If such a card did exist, the driver, in whatever OS you're using, would
need to support that as well, and would need to supply those packet to
whatever packet capture mechanism comes with the OS.
If it does that, tcpdump would presumably see the packet.
But, as per my first paragraph, I suspect it's not possible for a card
to receive those packets; if so, it's not possible to capture them.
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