To mitigate the effort to maintain my personal server, I am considering to only expose ssh port to the outside and use its socks proxy to reach other services. is Portknocking enough to reduce surface of attack to the minimum?
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Instead of ssh I use wireguard directly. It’s a simple protocol based on public/private keys with great performance and security.
Wireguard is stateless and establishes connections really quickly on demand. This means the battery isn’t impacted even though it’s always on, since the VPN doesn’t have to maintain a constant connection. At least that’s the case if your routing only a specific subnet (e.g. 192.168.1.0/24 and not all traffic through it 0.0.0.0/0).