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Version Negotiation doesn't have a packet number #1078

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merged 2 commits into from Jan 30, 2018
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Version Negotiation doesn't have a packet number #1078

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Version Negotiation doesn't have a packet number
martinthomson Jan 9, 2018
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Ian's suggestion
martinthomson Jan 29, 2018
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10 changes: 5 additions & 5 deletions draft-ietf-quic-transport.md
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Expand Up @@ -2376,11 +2376,11 @@ Unlike TCP SACKs, QUIC acknowledgements are irrevocable. Once a packet has
been acknowledged, even if it does not appear in a future ACK frame,
it remains acknowledged.

A client MUST NOT acknowledge Version Negotiation or Retry packets. Version
Negotiation packets don't contain a packet number and Retry packets include the
packet number from the Initial packet it responds to. Rather than relying on
ACK frames, these packets are implicitly acknowledged by the next Initial packet
sent by the client.
A client MUST NOT acknowledge Retry packets. Retry packets include the packet
number from the Initial packet it responds to. Version Negotiation packets
cannot be acknowledged because they do not contain a packet number. Rather than
relying on ACK frames, these packets are implicitly acknowledged by the next
Initial packet sent by the client.

A sender MAY intentionally skip packet numbers to introduce entropy into the
connection, to avoid opportunistic acknowledgement attacks. The sender SHOULD
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