Hey Radnoaz.Per below;
1. Essentially your router becomes the vpn server. the thing you authenticate to when you want to connect to your home network.
2. Its secure because with a vpn server it only allows users who have the Certificate (security file) to connect.
3. Thats why you have to generate the CERT at the router and IMPORT it at the devices you want to be able to connect.
4. Hackers that don't have this CERT theoritically will not be able to connect to your vpn from their devices. Only devices with the CERT can connect.
5. In addition there is also the vpn server user and password that is encrypted ( no one can see it) when you authenticate with the vpn server.
6.When you connect to the vpn server successfully its like you are at home on your wifi. You can connect from the vpn on your router to your home devices all encrypted communication that no one on the internet can see.
7. One more thing make sure you use a cipher/ encryption algorithum ( i forget which) but something strong like AES256.
OpenVpn for me defaulted to something less secure in bit length.
Thanks! When a family member visits, we've always let them into our LAN with the router access password. I've never looked into "guest" access. But I think I would want to set up guest access after switching to OpenVPN, yes? That way I wouldn't have to import the cert. to guest devices that normally don't reside here, but could still let them have internet access. They just couldn't access the internal LAN, correct?