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RE: Go Back to Single Packet Number Space

Nick Banks <nibanks@microsoft.com> Thu, 26 July 2018 04:37 UTC

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From: Nick Banks <nibanks@microsoft.com>
To: Tommy Pauly <tpauly@apple.com>, Dmitri Tikhonov <dtikhonov@litespeedtech.com>, "quic@ietf.org" <quic@ietf.org>
CC: Martin Thomson <martin.thomson@gmail.com>
Subject: RE: Go Back to Single Packet Number Space
Thread-Topic: Go Back to Single Packet Number Space
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Date: Thu, 26 Jul 2018 04:37:05 +0000
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Since there are four encryption levels, the fact that there are only three packet spaces only makes things more confusing IMO. If your argument is that matching them together makes things easier, then I’d think there should be four packet spaces. I think having all this duplication and separation just adds unnecessary complexity.



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________________________________
From: tpauly@apple.com <tpauly@apple.com> on behalf of Tommy Pauly <tpauly@apple.com>
Sent: Wednesday, July 25, 2018 9:26:49 PM
To: Dmitri Tikhonov
Cc: Martin Thomson; Nick Banks; QUIC WG
Subject: Re: Go Back to Single Packet Number Space

As another implementer, I also prefer having the split packet spaces. The point isn't necessarily that it's good to have the triple spaces, but rather that it's nice to have the packet number spaces correspond tightly with the packet types and protection. The logic for handling a space can be treated more uniformly in that way, although it does involve potentially more memory to store the state.

Thanks,
Tommy

> On Jul 25, 2018, at 8:01 PM, Dmitri Tikhonov <dtikhonov@litespeedtech.com> wrote:
>
> On Thu, Jul 26, 2018 at 11:41:48AM +1000, Martin Thomson wrote:
>> The feedback I've heard is that the simplification is subjective.
>> Others have said that a single space would complicate their
>> implementation considerably more.
>
> EKR is one of the "others" [1] -- are there other implementers who
> prefer the triple packet space?
>
>  - Dmitri.
>
> 1. https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fquicwg%2Fbase-drafts%2Fissues%2F1579%23issuecomment-405720217&amp;data=02%7C01%7Cnibanks%40microsoft.com%7C86b0eb2ea03c48a3fc7808d5f2b00684%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C1%7C636681760204180396&amp;sdata=fstGdvwnKKfApVKVQZFuJYdWAZkXCafUsEH0t1YtH8U%3D&amp;reserved=0
>

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