Re: [Int-area] Fwd: New Version Notification for draft-herbert-ipv4-eh-03.txt

[Toerless Eckert <[e-mail]>]

Just some questions about AH/ESP here:

What actually is (so far, without your draft) the technical benefits
and/or differences of ESP and AH in IPv6 being classified as IPv6
extension headers, as opposed in IPv4, where they are currently
defined as "yet another (next level) Protocol ?

Any difference in APIs for example ? I guess i might be able to implement
ESP/AH in IPv6 in user-level because i can expose extension header
to user-level UDP sockets (not 100% sure), whereas in IPv4 i would need
a (raw) IP socket to get them up to userland ??

Any other functional differences ? Aka: i couldn't find a simple:

"If i want to define a new protocol header, should i call it an
 extension header or an ipv6 extension header - for Dummies" ?

(at least for those examined only on the receiver obviously. HBH i do get.

I think you did not write it explicitly, but i would assume the IANA
Assigned Internet Protocols Numbers column "IPv6 Extension Header" would
be renamed to "IP/IPv6 Extension Header". But when this was done
to AH/ESP, and there actually is a functional difference expressed by
this extension header (as opposed to non-extension header) status, then
what be the imapct of this ? Aka: I upgrade my linux kernel to extension
header and all my AH/ESP breaks ?  Or i do get the benefit of above
(userland access) ?

Would there be any (backward compatibility) reason to have new codepoints in IPv4 for ESP/AH
with this extension header status and leave the existing (non extension
header) codepoints alone ?

Cheers
    Toerless

On Thu, Feb 22, 2024 at 05:40:31PM -0800, Tom Herbert wrote:
> Hi,
> 
> I updated the IPv4 extension headers draft. I structured it to be
> self-contained without any normative references for IPv6 RFCs. It's a
> little bigger, but about 80% of the text is cut-and-paste from other
> RFCs and drafts.
> 
> Comments are appreciated!
> 
> Tom
> 
> ---------- Forwarded message ---------
> From: <[e-mail]>
> Date: Thu, Feb 22, 2024 at 5:29 PM
> Subject: New Version Notification for draft-herbert-ipv4-eh-03.txt
> To: Tom Herbert <[e-mail]>
> 
> 
> A new version of Internet-Draft draft-herbert-ipv4-eh-03.txt has been
> successfully submitted by Tom Herbert and posted to the
> IETF repository.
> 
> Name:     draft-herbert-ipv4-eh
> Revision: 03
> Title:    IPv4 Extension Headers and Flow Label
> Date:     2024-02-23
> Group:    Individual Submission
> Pages:    47
> URL:      https://www.ietf.org/archive/id/draft-herbert-ipv4-eh-03.txt
> Status:   https://datatracker.ietf.org/doc/draft-herbert-ipv4-eh/
> HTMLized: https://datatracker.ietf.org/doc/html/draft-herbert-ipv4-eh
> Diff:     https://author-tools.ietf.org/iddiff?url2=draft-herbert-ipv4-eh-03
> 
> Abstract:
> 
>    This specification defines extension headers for IPv4 and an IPv4
>    flow label.  The goal is to provide a uniform and feasible method of
>    extensibility that is common between IPv4 and IPv6.
> 
> 
> 
> The IETF Secretariat
> 

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