Linux - Netstat

Commands

Route list:

netstat -rn

Display active connection with associate pid/progam:

netstat -taupen
# -t: tcp
# -a: all
# -u: udp
# -p: progam
# -e: extend (user/inode)
# -n: display numeric port

Tips

Group TCP connection's states

netstat -an |awk '/tcp/ {print $6}' |sort |uniq -c