Re: Connection IDs

Gorry Fairhurst <gorry@erg.abdn.ac.uk> Thu, 08 March 2018 08:25 UTC

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Date: Thu, 08 Mar 2018 08:18:18 +0000
From: Gorry Fairhurst <gorry@erg.abdn.ac.uk>
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To: Christian Huitema <huitema@huitema.net>
CC: "Lubashev, Igor" <ilubashe@akamai.com>, Martin Thomson <martin.thomson@gmail.com>, Jana Iyengar <jri.ietf@gmail.com>, Ian Swett <ianswett@google.com>, Subodh Iyengar <subodh@fb.com>, Mike Bishop <mbishop@evequefou.be>, Patrick McManus <pmcmanus@mozilla.com>, IETF QUIC WG <quic@ietf.org>
Subject: Re: Connection IDs
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Christian,

Do you see anything different here for QUIC compared to any other 
datagram transport?

It looks like the same problem for probing for PMTU for any UDP-based 
transport, and the ICMP issue with load-balancing is well-known (at 
least was discussed in the context of ECMP). I'd be interested in 
understanding experience with QUIC.

Gorry

On 08/03/2018, 00:45, Christian Huitema wrote:
> On 3/7/2018 4:36 PM, Lubashev, Igor wrote:
>
>> +1 for the connid direction from someone from an "eligible" employer.
>>
>> That said, the proposal precludes load balancers from using Conn ID possibly present in ICMP TooBig payload for routing the ICMP TooBig back to the server, so I am looking forward to "PMTUD for QUIC" talks in QUIC and TSVWG.
> Funny, Patrick and I were just discussing preparing a draft based on the
> experience with PMTU discovery in our implementation. Both work by
> sending PMTU probes composed or PING and/or PAD.
>
> I think that this kind of probing strategy is a good fit for an
> encrypted transport like QUIC. I would not want to let cleartext ICMP
> packets change the state of the connection. But this is a different thread.
>
> And yes, by the way, I do like the new Connection IDs.
>
> -- Christian Huitema