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Re: Packet number spaces in multipath (was Re: What to do about multipath in QUIC)

Martin Thomson <mt@lowentropy.net> Sun, 06 December 2020 23:24 UTC

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Date: Mon, 07 Dec 2020 10:24:15 +1100
From: Martin Thomson <mt@lowentropy.net>
To: quic@ietf.org
Subject: Re: Packet number spaces in multipath (was Re: What to do about multipath in QUIC)
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As this wasn't mentioned in the discussion:

On Wed, Nov 25, 2020, at 14:34, Jana Iyengar wrote:
> First though, a point on terminology: the receiver maintains a separate 
> "ReceivedPackets" for each CID, probably for each CID sequence number 
> (CSN). Let's please not call this a SACK Dashboard, to avoid confusion.
> 
> On the question of sending more than 2^32 packets, I think that 
> resetting the packet number (PN) is ok on new CIDs.

A design like this would require changes to the way that keys are generated.  Unfortunately, I think that this also increases the cost of key generation a little for reasons specific to the internal workings of the key derivation function.

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