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Re: [v6ops] Flow Label Load Balancing

Joseph Touch <touch@strayalpha.com> Sat, 28 November 2020 00:38 UTC

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From: Joseph Touch <touch@strayalpha.com>
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Date: Fri, 27 Nov 2020 16:38:18 -0800
Cc: Tom Herbert <tom@herbertland.com>, IPv6 Operations <v6ops@ietf.org>, tcpm <tcpm@ietf.org>, Fernando Gont <fernando@gont.com.ar>
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To: Mark Smith <markzzzsmith@gmail.com>
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Subject: Re: [v6ops] Flow Label Load Balancing
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> On Nov 27, 2020, at 4:32 PM, Mark Smith <markzzzsmith@gmail.com> wrote:
> 
> Steering packets is the network's job.

+1

> The Flow Label is the IPv6 header analogue for transport layer protocol ports, so that load balancing mechanisms don't have to dig further into the packet.

+1

> Can or are transport layer ports varied in TCP SYNs, SYN/ACKs and ACKs within the same TCP connection?

In general, no.

I proposed a method to decouple the SYN destination port (which currently is both part of the connection ID *and* identifies the service) from the port used for the rest of the connection, but largely to provide a separate service ID (originally draft-touch-tcp-portnames, later recast as a service name option in draft-touch-tcpm-sno). But that didn’t as much use different ports as decouple the service from connection ID number.

Joe

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