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close connection when receiving unprotected ACKs for protected packets #810

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3 changes: 2 additions & 1 deletion draft-ietf-quic-recovery.md
Expand Up @@ -529,7 +529,8 @@ largest acked packet is supplied.

#### Handshake Packets

The receiver MUST ignore unprotected packets that ack protected packets.
The receiver MUST close the connection with an error of type OPTIMISTIC_ACK
when receiving an unprotected packet that acks protected packets.
The receiver MUST trust protected acks for unprotected packets, however. Aside
from this, loss detection for handshake packets when an ack is processed is
identical to other packets.
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