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A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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There are variouse alternatives to see what ports are open. Usually they autyo scan just the ip you come from, to avoid being used to scan a potential target.
If you want more, just use Greenbone. Run it twice. Once from another IP just to know how the world sees you. One time internal network and add accounts to greenbone allowing it to login and check further.
If you run linux, then Lynis is awesome to verify your config
+1 for Lynis if you are scanning for vulnerabilities. Some of the recommendations won't really apply to a homelab, but it is pretty comprehensive. A great way to harden your server(s).