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Re: [tcpm] TCP Connection ID

Alexander Azimov <a.e.azimov@gmail.com> Wed, 20 May 2020 13:08 UTC

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From: Alexander Azimov <a.e.azimov@gmail.com>
Date: Wed, 20 May 2020 16:08:11 +0300
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To: Jonathan Morton <chromatix99@gmail.com>
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Subject: Re: [tcpm] TCP Connection ID
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Hi all,

The email from Joe got into the spam box, so I was able to find it only
after your notice. Thank you.

The Host Id presented in RFC7974 is a very different approach: it is
client-side id generated at the moment of the SYN which should help to
distinguish different hosts behind NAT.

What I'm looking for is a connection id, generated at the server-side and
sent back with a SYN/ACK, which is next mirrored by the client. It is not
meant for host identification, but it can be used for connection
identification by the middlebox under the same administrative control. And
there is no need to have a 1:1 map id to a server, instead, each server
should use randomized ids with encryption.

And speaking about IPv6 Flow Label it's not working for IPv4 + it current
implementation in Linux already has great use cases, so even in the world
of IPv6 only I would prefer to keep it without overloading its functions.

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