My Engineering Years: this post is from my early hands-on infrastructure days, kept for reference. See the rest of this era. NOTE: fw monitor operates above layer 2 and does not include mac address information - cant see ARP messages. tcpdump can see layer 2 ARP messages This is one of the most common tcpdump commands: (looks for packets from a src to dst, need to specify interface) tcpdump nn-i eth2 host 11.11.11.11 and host 22.22.22.22 08:02:15.043273 11.11.11.11.62044 > … [Read more...]