this post was submitted on 13 Oct 2024
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By default a fresh new instance will federate with no other instances period.
Instances only "learn" about the existence of an outside instance or community after a user enters a community+instance address in the search bar. After that, the home instance will sync with the remote instance and begin getting all new push data from that point on.
I don't know if Lemmy allows "whitelisting" of synced instances, such that it will auto synchronize with a provided list and ignore all others even if users search for them. I feel like it does, but I am not familiar enough with the backend to say yay or nay.
Yes that is afaik possible via https://fediseer.com/