Mandate QUIC as primary transport#5330
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sukunrt
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Jun 12, 2026
Co-authored-by: sukun <git@sukun.dev>
wemeetagain
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arnetheduck
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Co-authored-by: Jacek Sieka <arnetheduck@gmail.com>
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Alternative to #3866
Update the networking spec to make the libp2p QUIC transport mandatory and the primary transport, and to downgrade TCP from a mandatory baseline to a recommended (SHOULD) fallback.
When a peer is reachable over multiple transports, clients should now dial QUIC first and fall back to TCP only if a QUIC connection cannot be established. The Noise handshake and mplex/yamux multiplexing are reframed as belonging to the TCP fallback, with mplex being downgraded from MUST to MAY.