how to find out promiscuous mode

[Gilboa Davara]

On Wed, 2010-02-03 at 23:11 +0100, Vadkan Jozsef wrote:
> How can I find out that someone is using it's network card in
> promiscuous mode in a subnet?
> 
> Thank you!
> 

You can't.
... and even if you could, someone could potentially use a passive
splitter and yank all the packets of the subnet.

Having said all that, if your network is switched (as opposed to using
cheap FE hubs), only broadcast traffic (ARP/DHCP/etc) will be visible in
promisc mode.

- Gilboa