Detect Local Services
# netstat -tulnp
Detect Remote Services
# nmap -A -sT <server>
Capturing and analyzing network traffic
# tcpdump -D
to show all available capture interface
Example to capture port 22 from interface eth0
# tcpdump -nn -l -s 2000 -w packets -i eth0 'port 22'
Analyzing network packet with wireshark
install the wireshark-gnome
copy out the output of tcpdumb
# wireshark <tcpdumb file>
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