Re: [Ace] [Secdispatch] FW: [secdir] EDHOC and Transports

"Valery Smyslov" <smyslov.ietf@gmail.com> Tue, 19 February 2019 18:02 UTC

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From: "Valery Smyslov" <smyslov.ietf@gmail.com>
To: "'Michael Richardson'" <mcr+ietf@sandelman.ca>
Cc: '=?UTF-8?Q?'G=C3=B6ran_Selander'?=' <goran.selander@ericsson.com>, <secdispatch@ietf.org>, <ace@ietf.org>
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Date: Tue, 19 Feb 2019 21:01:56 +0300
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Subject: Re: [Ace] [Secdispatch] FW: [secdir] EDHOC and Transports
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Hi Michael,

> When done over CoAP, the message would be sent with CONfirmable, so it
> would be ACK'ed.  I would make the first message CONfirmable too.
> 
> That makes it much like IKEv2 is, where all messages are ACKed and the
> initiator is responsible for all retransmits.

Sure, there must be no problems with COAP or other reliable transport.

> If someone wants to run EDHOC over another transport, then they would
> need to take this into account.

That was my point.

Regards,
Valery.
 
>     > So, unless you rely on a reliable transport that preserves packets
ordering,
>     > having odd number of messages significantly complicates
> implementations.
> 
> CoAP is reliable, and it does preserve packet ordering if asked to.
> 
> --
> Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
> -= IPv6 IoT consulting =-