Absolutely! Wireguard (for example) uses UDP 51820 (normally) which will mlre than likely be blocked, but that won’t stop you from using something like cntlm to proxy it over an allowed port like 443/80. DPI or some intercepting proxies would likely still filter it.
Client seperation is implemented by the AP. There’s lots of info, it’s called client isolation normally. check this out
It depends on his threat model and what he’s trying to hide really. Public WiFi is fine, as long as you validate/check the SSL cert it’s using is from your bank and is legitimate. Using public WiFi with a VPN is more secure as long as you trust your VPN provider. If he’s asking these questions, then he’s probably not doing banking though, and should ideally be using VPN+TOR or something similar.
Still does nothing when scanning the entire ipv4 address space achievable so quickly. You can also use services like shodan to find vulnerable services on any ports.
Use SSH keys, stay upgraded. Make management services (SSH, RDP, admin services) accessible only via VPN (WireGuard). Only expose 80 and 443 to the internet, if necessary.
I made a poc https://modder.lemmyverse.net tool that I’m hoping to expand on for Lemmy tooling 😄
Yeah absolutely if he’s downloading Linux ISOs, just use a VPN and you’ll be fine 99% of the time. TOR if he is doing anything else surrupticiaous. 😬