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Note that the QUIC bit cannot be used with forwarding mode #89

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Note that the QUIC bit cannot be used with forwarding mode #89

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Note that the QUIC bit cannot be used with forwarding mode
bemasc Oct 26, 2023
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bemasc Oct 26, 2023
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15 changes: 15 additions & 0 deletions draft-ietf-masque-quic-proxy.md
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Expand Up @@ -734,6 +734,21 @@ headers does not apply.
A proxy MAY additionally add ECN markings to signal congestion being experienced
on the proxy itself.

## QUIC Version Independence

When forwarding mode is enabled, the client and target MAY negotiate any QUIC
version, and MAY send packets of that version through the forwarding path.
The proxy does not know what version they are using, so it can only require that
these packets conform to the QUIC invariants for short-header packets
({{?RFC8999}}, Section 5.2).

QUIC version 1 specifies a Fixed Bit (a.k.a. the "QUIC bit") with a fixed value
to support sharing a 5-tuple with other protocols such as DTLS, but the QUIC
invariants do not guarantee the value of this bit. Accordingly proxies with
forwarding mode enabled MUST NOT rely on this bit for protocol identification,
and SHOULD send and accept the `grease_quic_bit` transport parameter
{{?QUIC-GREASE=RFC9297}} to avoid ossification of the forwarding mode path.

# Example

Consider a client that is establishing a new QUIC connection through the proxy.
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