Re: [manet] [Technical Errata Reported] RFC8175 (6472)

["Velt, R. (Ronald) in 't" <[e-mail]>]

Hi,

I forwarded the message below to Henning Rogge in order to get one more datapoint on the question what current implementations do. (Maybe we should ask David Wiggins as well).

With respect to the text correction, I can see the issue with the double MUST. However, in the proposed alternative, there is no MUST at all, just a SHOULD (and a lower case ‘should’). Somehow, that does not seem entirely right to me. So far, I have not been able to come up with anything better, though. I’ll think about it some more. BTW, what about the phrasing of “If the Modem is not including IPv4 and IPv6 Connection Point Data Items …”; shouldn’t that read: “If the Modem is including neither an IPv4 Connection Point Data Item nor an IPv6 Connection Point Data Item …”? What if the Modem is including just a IPv6 Connection Point Data Item, but the Peer Discovery Signal was sent over IPv4 (or vice versa)? Should we elaborate here to stave off future errata?

Regards,
Ronald

From: Alvaro Retana <[e-mail]>
Sent: maandag 10 mei 2021 20:01
To: Rick Taylor <[e-mail]>; Velt, R. (Ronald) in 't <[e-mail]>; [e-mail]
Cc: [e-mail]
Subject: RE: [Technical Errata Reported] RFC8175 (6472)

Ping!


On March 29, 2021 at 2:04:35 PM, Alvaro Retana ([e-mail]<mailto:[e-mail]>) wrote:
[- Rick’s additional address, RFC Editor, other ADs.]


On March 10, 2021 at 11:05:03 AM, Rick Taylor wrote:


Hi!

I'm processing this report...but I have a question.  What do current implementations do?  See move below.


...
> > Section: 12.4, para 2
> >
> > Original Text
> > -------------
> > A Peer Offer Signal MUST be encoded within a UDP packet. The IP source
> > and destination fields in the packet MUST be set by swapping the values
> > received in the Peer Discovery Signal. The Peer Offer Signal completes the
> > discovery process; see Section 7.1.
> >
> > Corrected Text
> > --------------
> > A Peer Offer Signal MUST be encoded within a UDP packet. If the Modem is
> > not including IPv4 and IPv6 Connection Point Data Items in the Peer Offer
> > Signal, then the IP source field in the packet MUST be set to the unicast
> > address the router must use when connecting the DLEP TCP session,
> > otherwise any valid local address MUST be used. The IP destination field
> > in the packet MUST be set to the IP source field value received in the
> > Peer Discovery Signal. The Peer Offer Signal completes the discovery
> > process; see Section 7.1.
> >
> > Notes
> > -----
> > The original text will not result in a valid unicast IP packet.


The new text is this:

   If the Modem is not including IPv4 and IPv6 Connection Point Data Items in
   the Peer Offer Signal, then the IP source field in the packet MUST be set
   to the unicast address the router must use when connecting the DLEP TCP
   session, otherwise any valid local address MUST be used.

I am having an issue with the double MUST.  Regardless of whether a Connection Point Data Item is present, why wouldn't it be required (or at least recommended) to always use the TCP-related IP address?

Proposal (to replace the new text)>
   The source IP address SHOULD be the address the peer should use when
   connecting the DLEP TCP session.  If a Connection Point Data Item is
   included, any valid local address MAY be used instead.


??

Thanks!

Alvaro.
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