Devices at home usually have private IPs (192.168.x.x or 10.x.x.x). Your router uses NAT so many devices share one public IP on the internet.

Static IPs for servers (DNS, proxy, storage) prevent breakage when DHCP renumbers machines.

SSH (port 22) is the standard way to administer Linux remotely — prefer key-based login over passwords.

DNS + NAT together: internal clients ask local DNS for friendly names; the router translates outbound connections to the shared public IP.

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