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Don't Change Source CID After Retry #1491

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merged 3 commits into from Jun 27, 2018
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Don't Change Source CID After Retry #1491

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Don't Change Source CID After Retry
nibanks Jun 27, 2018
6d48169
should -> must
nibanks Jun 27, 2018
6a68e07
Removing extra text
martinthomson Jun 27, 2018
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4 changes: 3 additions & 1 deletion draft-ietf-quic-transport.md
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Expand Up @@ -633,7 +633,9 @@ If the client received a Retry packet from the server and sends an Initial
packet in response, then it sets the Destination Connection ID to the value from
the Source Connection ID in the Retry packet. Changing Destination Connection ID
also results in a change to the keys used to protect the Initial packet. It also
sets the Token field to the token provided in the Retry.
sets the Token field to the token provided in the Retry. The client MUST NOT
change the Source Connection ID because the server could include the connection
ID as part of its token validation logic.

When a server receives an Initial packet with an address validation token, it
SHOULD attempt to validate it. If the token is invalid then the server SHOULD
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