Take the tour ×  What tools or techniques are available for *nix
and Windows that help in finding if someone else on the LAN is
using a sniffer?  Having said that and strongly considering that
there are tools out there to discover such "phenomena" what
would be the work around to not getting sniffed?  Many Thanks.
share|improve this question add comment  10 Answers  up vote 14
down vote accepted  It is very difficult to detect sniffers,
because they work passively. Some sniffers do generate small
amounts of traffic and though, so there are some techniques for
detecting them.    • Machines cache ARPs (Address Resolution
Protocol). Sending a non-broadcast ARP, a machine in promiscuous
mode (a network card that makes the card pass all traffic) will
cache your ARP address. Then, sending a broadcast ping packet
with our IP, but a different MAC address. Only a machine which
has our correct MAC address from the sniffed ARP frame will be
able to respond to our broadcast ping request. So, if the
machine is responding