@nimda @silverpill not sure about Mitra implementation, but it's ActivityPub level: for example, I can't follow username@wizard.casa because wizard.casa is the internet (not local) host (IP resolved is not 0200::/7).
I can view the web interface, but API interaction still goes to original host ID.
The only option imho, is using proxy with content replacement (e.g. with sub_filter) or maybe handle these multiple IDs with Mitra backend from some aliases array in config, according to the current address family of connection.
In other words, multi-network mode support would be super useful feature for Mitra, because all solutions I know, works with Internet mode only.
For example, we can create some networks routing Enum with address match implementation (you can find an example for Yggdrasil pattern in the Alfis DNS: https://github.com/Revertron/Alfis/blob/master/src/commons/mod.rs#L107, same for Mycelium, CJDNS, etc)
Doubts only is it possible, as the messages stored in JSON format, where content includes static links to only one ID. Thoughts, the ActivityPub restriction.