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Re: [Anima-bootstrap] bootstrap over CoAP

"Max Pritikin (pritikin)" <pritikin@cisco.com> Sun, 10 July 2016 17:14 UTC

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From: "Max Pritikin (pritikin)" <pritikin@cisco.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Thread-Topic: [Anima-bootstrap] bootstrap over CoAP
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Date: Sun, 10 Jul 2016 17:14:34 +0000
Message-ID: <8D35379D-678D-4293-93E4-150253AE46CE@cisco.com>
References: <3A2F4C70-4960-4592-9314-6EC53B53CC94@cisco.com> <5d5623cd-fe4b-e443-da5d-6a43ffb9b5c6@gmail.com> <57810029.2070408@tzi.org> <17d1c08e-e9c6-d017-58ba-85989d56273d@gmail.com> <5781531A.1080702@tzi.org> <729980b6-767a-b675-1874-5c8e1fefd025@gmail.com>
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Cc: Carsten Bormann <cabo@tzi.org>, "anima-bootstrap@ietf.org" <anima-bootstrap@ietf.org>, "Panos Kampanakis (pkampana)" <pkampana@cisco.com>
Subject: Re: [Anima-bootstrap] bootstrap over CoAP
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> On Jul 9, 2016, at 11:33 PM, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
> 
> On 10/07/2016 07:40, Carsten Bormann wrote:
>>>> I'm not sure I understood that part of the draft*), but generally CoAP
>>>> is designed so you can avoid fragmentation 
>>> 
>>> That isn't what the draft seems to say, though. However, it's clearly talking
>>> about application-layer fragmentation to avoid IP fragmentation.
>> 
>> (that's segmentation...  I know.)
>> 
>>>> (and use the segmentation
>>>> provided by draft-ietf-core-block instead); the latter has per-segment
>>>> reliability (acknowledgements and retransmits).   DTLS may require
>>>> fragmentation during its handshake; this is mitigated if you can use a
>>>> PSK (symmetric) or, if you need asymmetric, ECC-based ciphersuite, which
>>>> allows the packets to stay well below 1280 bytes.
>>> 
>>> Right. So the app layer chops the message into <1280 byte pieces, and one
>>> of them is lost...?
>> 
>> Each of those segments ("blocks") is (actually, can be, but you do want
>> to do this with the block-wise protocol) transmitted reliably, so it
>> doesn't get lost.
> 
> OK, so I think that a couple of sentences in draft-pritikin-coap-bootstrap
> could clarify all that.

Thank you. We can make that happen,

- max


> 
> Thanks
>    Brian
> 
>> Grüße, Carsten

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