Re: [IPsec] Draft-ietf-ipsecme-ipv6-ipv4-codes

Paul Wouters <paul@nohats.ca> Tue, 30 April 2019 13:42 UTC

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Date: Tue, 30 Apr 2019 09:42:39 -0400
From: Paul Wouters <paul@nohats.ca>
To: Valery Smyslov <smyslov.ietf@gmail.com>
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Subject: Re: [IPsec] Draft-ietf-ipsecme-ipv6-ipv4-codes
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On Tue, 30 Apr 2019, Valery Smyslov wrote:

>> I would prefer no notify if the request was fulfilled and to only send a notify if a request could not be fulfilled.
>> Since clients can ask for both that should cover things. If a client isn’t asking for ipvX, I see no need to answer
>> that ipvX is supported too.
>
> That would make sending these notifies dependent on the content of request.

Yes, like all CP payloads?

> So, the tradeoff is whether saving eight bytes justifies complication of state machine.

It's not about saving bytes for me, but about the logic and simplicity
on the wire. If a client isn't asking for v6, why tell them about our
v6 capabilities?

I see that quite different from "if you want compression, it is
available". The address family is a much more fundamental property
of an IPsec tunnel. It's not a bell or whistle.

Paul