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Self hosting lemmy behind CGNAT?
(lemmy.ml)
Everything about Lemmy; bugs, gripes, praises, and advocacy.
For discussion about the lemmy.ml instance, go to !meta@lemmy.ml.
My understanding is that ActivityPub is designed with the expectation that servers can look one another's names up in DNS and initiate TCP connections to one another.
So even if all of your end-users are on your LAN, your instance still needs to have a public address that's discoverable in DNS, etc.
You might be able to rig this up via tunneling, but you'd still need a public address on the other end of the tunnel.