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Explain the fixed bit recommendation for Version Negotiation #4744

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merged 3 commits into from Jan 15, 2021
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Explain the fixed bit recommendation for Version Negotiation #4744

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e6fd864
Explain the fixed bit recommendation for Version Negotiation
martinthomson Jan 14, 2021
827cd37
Set to an arbitrary value
martinthomson Jan 14, 2021
4ab59bf
This is not reliable
martinthomson Jan 14, 2021
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11 changes: 6 additions & 5 deletions draft-ietf-quic-transport.md
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Expand Up @@ -4665,11 +4665,12 @@ Version Negotiation Packet {
~~~
{: #version-negotiation-format title="Version Negotiation Packet"}

The value in the Unused field is selected randomly by the server. Clients MUST
ignore the value of this field. Where QUIC might be multiplexed with other
protocols (see {{?RFC7983}}), servers SHOULD set the most significant bit of
this field (0x40) to 1 so that Version Negotiation packets appear to have the
Fixed Bit field.
The value in the Unused field is set to an arbitrary value by the server.
Clients MUST ignore the value of this field. Where QUIC might be multiplexed
with other protocols (see {{?RFC7983}}), servers SHOULD set the most significant
bit of this field (0x40) to 1 so that Version Negotiation packets appear to have
the Fixed Bit field. Note that other versions of QUIC might not make a similar
recommendation.

The Version field of a Version Negotiation packet MUST be set to 0x00000000.

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