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Re: [dhcwg] DHCPv6 and IPv6ND

"Bernie Volz (volz)" <volz@cisco.com> Thu, 16 November 2017 06:50 UTC

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From: "Bernie Volz (volz)" <volz@cisco.com>
To: Ted Lemon <mellon@fugue.com>
CC: Alexandru Petrescu <alexandru.petrescu@gmail.com>, dhcwg <dhcwg@ietf.org>
Thread-Topic: [dhcwg] DHCPv6 and IPv6ND
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Date: Thu, 16 Nov 2017 06:50:23 +0000
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References: <cf2e41a05fd742a3b576ee317c5392f6@XCH15-06-08.nw.nos.boeing.com> <E94F8CD6-EC4E-4B61-92B6-99FBD1D494A4@fugue.com> <8d935331012947aa942e8dc2a48d889f@XCH15-06-08.nw.nos.boeing.com> <54D1B686-A5FA-42A0-8A57-067562313488@fugue.com> <38ef2544-df5c-4677-ffaa-7b084eb300fa@gmail.com> <CAPt1N1k7CBvTOHFFoNeS6TMq_dkvSQTJ4TXR=Yt8S-6p--eabg@mail.gmail.com> <e4df5049-2548-6762-994d-a12c8f663e59@gmail.com> <8E4C374A-DA6D-4FAB-AAEA-7EB4A2A655D8@fugue.com> <68a1f0db-58d3-fe0e-8169-127c0b629df1@gmail.com> <89CE6E3F-7501-4A8D-9A1B-5638A8845E7D@fugue.com> <7ef058e6-0360-f86c-b7d8-8eaf129a7f95@gmail.com> <CAPt1N1=o+N64kdoYSSG38rwazAj_Lj9xLUV4uDCAzxbcpref1g@mail.gmail.com> <d194e3a4-620f-dde3-c836-3b5122d2805b@gmail.com> <FA0DADA0-CD16-4538-9E71-19922AD106B9@cisco.com> <c1209cd5-270e-63fe-8d78-c6371f9f56ef@gmail.com> <2907A64D-BB00-4922-BA6F-AA596AC878AB@fugue.com> <0b88f8af-2cbd-e6b2-ff22-50d682a66e8f@gmail.com> <953BFAD3-BAD7-4A1D-A102-2A6C7873052C@fugue.com> <3f898368-6222-d87c-7baa-38dea51a6980@gmail.com>, <CA800BAA-8BA4-4264-9062-EE584B39D29E@fugue.com>
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Subject: Re: [dhcwg] DHCPv6 and IPv6ND
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See RFC 6459:


5.3<https://tools.ietf.org/html/rfc6459#section-5.3>.  Prefix Delegation


   IPv6 prefix delegation is a part of Release-10 and is not covered by
   any earlier releases.  However, the /64 prefix allocated for each
   default bearer (and to the UE) may be shared to the local area
   network by the UE implementing Neighbor Discovery proxy (ND proxy)
   [RFC4389<https://tools.ietf.org/html/rfc4389>] functionality.

   The Release-10 prefix delegation uses the DHCPv6-based prefix
   delegation [RFC3633<https://tools.ietf.org/html/rfc3633>].  The model defined for Release-10 requires
   aggregatable prefixes, which means the /64 prefix allocated for the
   default bearer (and to the UE) must be part of the shorter delegated
   prefix.  DHCPv6 prefix delegation has an explicit limitation,
   described in Section 12.1 of [RFC3633]<https://tools.ietf.org/html/rfc3633#section-12.1>, that a prefix delegated to a
   requesting router cannot be used by the delegating router (i.e., the
   PDN-GW in this case).  This implies that the shorter 'delegated
   prefix' cannot be given to the requesting router (i.e., the UE) as
   such but has to be delivered by the delegating router (i.e., the
   PDN-GW) in such a way that the /64 prefix allocated to the default
   bearer is not part of the 'delegated prefix'.  An option to exclude a
   prefix from delegation [PD-EXCLUDE<https://tools.ietf.org/html/rfc6459#ref-PD-EXCLUDE>] prevents this problem.



Perhaps you are on an early Release?

- Bernie (from iPhone)

On Nov 16, 2017, at 2:40 PM, Ted Lemon <mellon@fugue.com<mailto:mellon@fugue.com>> wrote:

On Nov 16, 2017, at 2:38 PM, Alexandru Petrescu <alexandru.petrescu@gmail.com<mailto:alexandru.petrescu@gmail.com>> wrote:
If so, this entire issue about making DHCPv6 work on 3GPP networks should be forgotten.   It's impossible to make it work.

It is not impossible.   It is impossible for the IETF.

If you want to define a standard for 3GPP to do DHCP over a different port, that sounds fine.   But it's not an IETF thing—this is a specifically 3GPP problem, and it doesn't make any sense to write an IETF standard to work around it.   Suppose we did so: what advice would we give to implementors?

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