A device that has no IPv4 connectivity - but IPv6 - will be unable to discover LAN servers.
The client logs the following warning in the “Multiplayer” screen:
[Render thread/WARN]: Unable to start LAN server detection: Network interface not configured for IPv4The problem can be reproduced by starting the game with
-Djava.net.preferIPv6Addresses=truewhile being in a IPv6 capable network.
Cause:
The client discovers LAN servers only via the hardcoded IPv4 multicast address
224.0.2.60
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We're tracking this issue in MC-92923, so this ticket is being resolved and linked as a duplicate.
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