LiveKit's startup warning about UDP receive buffer being too small
(default 212992 bytes vs suggested 5000000) is easy to overlook, but
under load — especially when many clients are forced through the TURN
relay — it causes dtls timeouts on publisher transports and asymmetric
black-tile / no-media symptoms. The fix has to be on the host because
net.core.rmem_max / wmem_max are read when LiveKit opens its UDP sockets
and can't be raised from inside the container.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
