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Re: [quicwg/base-drafts] Proposal to make Version Negotiation more like Retry to punt VN to QUICv2 (#2313)

David Schinazi <notifications@github.com> Tue, 08 January 2019 17:33 UTC

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Subject: Re: [quicwg/base-drafts] Proposal to make Version Negotiation more like Retry to punt VN to QUICv2 (#2313)
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DavidSchinazi commented on this pull request.



>  
-The server MUST include the value from the Source Connection ID field of the
-packet it receives in the Destination Connection ID field.  The value for Source
-Connection ID MUST be copied from the Destination Connection ID of the received
-packet, which is initially randomly selected by a client.  Echoing both
-connection IDs gives clients some assurance that the server received the packet
-and that the Version Negotiation packet was not generated by an off-path
-attacker.
+Reserved Bits (R):

The added text here is to add new fields to VN packets. This PR adds ODCIL and Original Destination Connection ID to allow the server to send a new source connection ID (similar to how Retry packets work today). The PR also adds a Number of Supported Versions field to allow future extensibility.


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