Re: [dhcwg] DHCPv6 and IPv6ND

<mohamed.boucadair@orange.com> Thu, 16 November 2017 11:25 UTC

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From: <mohamed.boucadair@orange.com>
To: Alexandru Petrescu <alexandru.petrescu@gmail.com>
CC: Ted Lemon <mellon@fugue.com>, dhcwg <dhcwg@ietf.org>, "Bernie Volz (volz)" <volz@cisco.com>
Thread-Topic: [dhcwg] DHCPv6 and IPv6ND
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Date: Thu, 16 Nov 2017 11:25:52 +0000
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Subject: Re: [dhcwg] DHCPv6 and IPv6ND
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Re-,

Please see inline. 

Cheers,
Med

> -----Message d'origine-----
> De : Alexandru Petrescu [mailto:alexandru.petrescu@gmail.com]
> Envoyé : jeudi 16 novembre 2017 12:05
> À : BOUCADAIR Mohamed IMT/OLN
> Cc : Ted Lemon; dhcwg; Bernie Volz (volz)
> Objet : Re: [dhcwg] DHCPv6 and IPv6ND
> 
> Med,
> Which part do you disagree with in my text?
> 
> I agree the problems are indeed implementation problems,

[Med] Cool. 

 but I need to
> understand which part do you disagree?
> 

[Med] I disagree that the spec needs to say that the port number is variable. This should be left to implementers, if neede. BTW, configuring a distinct port number will require that the client is able to learn that alternate port. This will lead to more interoperability problems than it solves. 

> Do you disagree when I say that the entire issue about making DHCPv6
> work on 3GPP should be forgotten?

[Med] Prefix delegation can work easily in cellular networks if all involved parties/implementers are following current specs. That is: 
- The client uses the defined multicast address + service port when issuing its solicit messages + supply prefix_exclude. 
- The server listens on the service port + does not make any assumption about the source IP address + treat DUIDs as opaque values that are only used to compare equality. 

I'm aware that some messages are "blocked" by some shipset vendors, but again this is an implementation issue. 
  
I do agree with you it is frustrating. 

  Or other part?
> 
> Alex
> 
> Le 16/11/2017 à 11:08, mohamed.boucadair@orange.com a écrit :
> > Hi Alex,
> >
> > I disagree.
> >
> > The problems you are describing are implementation ones.
> >
> > Cheers,
> > Med
> >
> >> -----Message d'origine-----
> >> De : dhcwg [mailto:dhcwg-bounces@ietf.org] De la part de Alexandru
> >> Petrescu
> >> Envoyé : jeudi 16 novembre 2017 07:38
> >> À : Ted Lemon
> >> Cc : dhcwg; Bernie Volz (volz)
> >> Objet : Re: [dhcwg] DHCPv6 and IPv6ND
> >>
> >>
> >>
> >> Le 16/11/2017 à 06:29, Ted Lemon a écrit :
> >>> I'm having trouble figuring out how changing the port would help.
> >>> You'd still have to make the same modifications.   You'd still have
> >>> to define a business model.
> >>
> >> _If_ there is a standard that says port number is variable, and if
> >> hardware manufacturer implements it, then it will help.
> >>
> >> If not, not.
> >>
> >> If so, this entire issue about making DHCPv6 work on 3GPP networks
> >> should be forgotten.   It's impossible to make it work.
> >>
> >> That puts the discussion of DHCPv6 and IPv6ND outside the 3GPP context
> >> altogether.
> >>
> >> For the business model: I am not an economist.
> >>
> >> Alex
> >>
> >>>
> >>>
> >>
> >> _______________________________________________
> >> dhcwg mailing list
> >> dhcwg@ietf.org
> >> https://www.ietf.org/mailman/listinfo/dhcwg