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Don't Change Source CID After Retry #1491

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5 changes: 2 additions & 3 deletions draft-ietf-quic-transport.md
Expand Up @@ -634,10 +634,9 @@ 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. Additionally, the
client SHOULD NOT change the Source Connection ID because the server may include
client MUST NOT change the Source Connection ID because the server may include
the connection ID as part of its token validation logic. If the client changes
the Source Connection ID in this case, it would likely trigger a new Retry to be
sent.
the Source Connection ID in this case it could trigger a new Retry to be sent.

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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