scanning services that are running:

sudo nmap -T Aggressive -A -v 127.0.0.1 -p 1-10000

sudo netstat --tcp --udp --listening --program

lists programs with port numbers: `sudo netstat -tup`

sudo lsof +M -i4 -i6

let's encrypt certbot instructions for apache:
https://certbot.eff.org/lets-encrypt/ubuntubionic-apache


ip setup:
https://help.ubuntu.com/lts/serverguide/network-configuration.html


## network interfaces
`ip link` lists all interfaces
multipass setup some dummy interfaces and left them there.
to delete did `ip link delete mpqemubr0-dummy`