I have been search on the internet for some time but can't really find an answer to my question;
Is it possible (common) to scan or hack a network device (such as a router or computer) without being connected to that network?
For example, can I use tools such as Nmap, Metasploit, or Nessus to scan a MAC address for vulnerabilities or open ports?
Can I take that further and remotely compromise a system without a connection to it?
I know there is tools such as Aircrack, but that uses promiscuous mode enabled network cards.
I'm assuming the answer is no because there is secuirty measures in place that would probaly block any sort of connection outside authentication.