Re: [IPsec] IPTFS and transport mode.

Valery Smyslov <smyslov.ietf@gmail.com> Thu, 07 May 2020 07:52 UTC

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From: Valery Smyslov <smyslov.ietf@gmail.com>
To: 'Christian Hopps' <chopps@chopps.org>, 'Michael Richardson' <mcr+ietf@sandelman.ca>
Cc: ipsec@ietf.org
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Date: Thu, 07 May 2020 10:52:10 +0300
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Subject: Re: [IPsec] IPTFS and transport mode.
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Hi,

> > Christian Hopps <chopps@chopps.org> wrote:
> The primary thing I'm suggesting here is that we define TFS transport mode
in
> a separate draft.

I agree that transport mode should be described in a separate draft
provided that a tunnel mode draft will allow easy adding of transport mode. 

> Whether we support generic transport or only a subset of transport
> configurations (e.g., tunnels) or both, the reasons we make whatever
choices
> we make, and the mechanisms for how to implement TFS with whatever is
> chosen, is what this new draft would cover. I see this building on top of
the TFS
> tunnel mode draft.

I think a generic transport mode should be supported.
Any specific configuration (like GRE+transport) regardless 
of how widely it is used today, may become extinct tomorrow.

Regards,
Valery.

> The rest of what I put above was really just ideas for what would go in
that
> new draft. My thinking that if we wanted to support a subset of transport
> mode configurations (e.g., for use with GRE, SRv6, IP-IP, etc) we could
specify
> that by defining a set of restrictions on the user IP headers. I'm not
sure if
> that's what you mean is a hack or not, but I figured if we define it by
the
> restrictions rather than specifically only for GRE it's more broadly
useful for
> little extra cost. In any case the discussion of this and definition is
what I think
> would go well in the context of it's own draft.
> 
> Thanks,
> Chris.