HPing3
# Send 2 syn packets to port 80 on a host
hping3 -c 2 -S -p 80 example.com
# scan a some specfic ports on host
sudo hping3 -S example.com --scan 143,220,993,25,80
TCPDump
# capture packets on -ivenet0 interface, don't resolve addresses or port name (-nn) don't capture ssh traffic
tcpdump -ivenet0 -nn not tcp port 22
# the same as above but don't print minimal information (useful as a quick guide to see whats going over the wire)
tcpdump -ivenet0 -nn -q not tcp port 22
# specify a port and destination
tcpdump -ieth0 tcp port 443 and dst example.com
# capture all payload (-s0) and print it in ASCII format (-v -A)
tcpdump -ivenet0 -s0 -nn -v -A not tcp port 22
# dump all packets and payload to file
tcpdump -s0 -ieth0 port 80 -w localhostdump.pcap
