netstat.md

Unix

netstat

Useful tool for checking your network configuration and activity. Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships

Listing all ports

netstat -a | more

Other network protocol Ports connections

netstat -at   # TCP
netstat -au   # UDP
netstat -ax   # Sockets

Show the PID and name of the program to which each socket belongs.

netstat -p

LISTENING Connections

netstat -l    # all
netstat -lt   # TCP
netstat -lu   # UDP
netstat -lx   # UNIX listening ports

Showing Statistics by Protocol

netstat -s    # TCP, UDP, ICMP, and IP protocols.
netstat -st   # TCP
netstat -su   # UDP

Continuous Listening

netstat -anlpc |grep 8080

Important command:

List the network open ports on your Linux server and the process that owns them

netstat -tulpn
netsta -tunlp | grep 22
lsof -i
# -t : TCP
# -u : UDP
# -n : Show numerical addresses instead of trying to determine symbolic host, port or user names
# -l : Show only listening
# -p : Show the PID and name of the program to which each socket belongs

Good link to find more here

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