netstat:
netstat --tcp -lp #To see what applications are listening on what ports, type command
netstat -a #show both listening and non-listening sockes;
netstat -p #show the PID to which each socket belongs;
netstat -s #display summary statistics for reach protocol;

netstat -p -l #show active internet sockets and there pids

netstat -i #show mtu size
#mtu permanent verdrehen:
/etc/sysctl.conf
man sysctl

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