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With https://github.com/libp2p/specs/pull/368 the definition of the _peer name_ changed in the mDNS specification. > peer-name is the case-insensitive unique identifier of the peer, and is less > than 64 characters. > > As the this field doesn't carry any meaning, it is sufficient to ensure the > uniqueness of this identifier. Peers SHOULD generate a random, lower-case > alphanumeric string of least 32 characters in length when booting up their > node. Peers SHOULD NOT use their Peer ID here because a future Peer ID could > exceed the DNS label limit of 63 characters. https://github.com/libp2p/specs/blob/master/discovery/mdns.md This commit adjusts `libp2p-mdns` accordingly. Also see https://github.com/libp2p/go-libp2p/pull/1222 for the corresponding change on the Golang side. Co-authored-by: Max Inden <mail@max-inden.de>