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Re: [Masque] WGLC for "Requirements for a MASQUE Protocol to Proxy IP Traffic"

Chris Box <chris.box.ietf@gmail.com> Thu, 10 June 2021 17:43 UTC

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From: Chris Box <chris.box.ietf@gmail.com>
Date: Thu, 10 Jun 2021 18:43:34 +0100
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To: Christopher Wood <caw@heapingbits.net>, masque@ietf.org
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Subject: Re: [Masque] WGLC for "Requirements for a MASQUE Protocol to Proxy IP Traffic"
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I have what is possibly a stupid question. It's regarding this section:

3.3 <https://datatracker.ietf.org/doc/html/draft-ietf-masque-ip-proxy-reqs-02#section-3.3>.
Maximum Transmission Unit

   The protocol will allow endpoints to inform each other of the Maximum
   Transmission Unit (MTU) they are willing to forward.  This will allow
   avoiding IP fragmentation, especially as IPv6 does not allow IP
   fragmentation by nodes along the path.


In the case where at least one end of the tunnel is a network, what is the
definition of endpoint here? I'm confused because in my head this protocol
can only convey information between each end of the tunnel, whereas in
order to influence MTU, this information needs to go to the actual sender
located somewhere within the network of section 2.3 or 2.4. That sender is
a different definition of endpoint.

Presumably only the ends of the tunnel exchange MTU information directly,
and then they rely on influencing PMTU Discovery to adjust the actions of
the sender?

Chris


On Wed, 26 May 2021 at 15:34, Christopher Wood <caw@heapingbits.net> wrote:

> This email starts the working group last call for "Requirements for a
> MASQUE Protocol to Proxy IP Traffic", located here:
>
>    https://datatracker.ietf.org/doc/draft-ietf-masque-ip-proxy-reqs/
>
> This last call serves to solidify requirements for subsequent work on
> CONNECT-IP solutions, as discussed in [1].
>
> Please review the document and send your comments to the list by June 11.
>
> Note the the GitHub repository for this draft can be found here:
>
>    https://github.com/ietf-wg-masque/draft-ietf-masque-ip-proxy-reqs
>
> Thanks,
> Chris and Eric
>
> [1]
> https://mailarchive.ietf.org/arch/msg/masque/LXObvy1DDuxLs-3dndyNKY0W4Gs/
>
> --
> Masque mailing list
> Masque@ietf.org
> https://www.ietf.org/mailman/listinfo/masque
>

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