Le 22/03/2018 à 18:49, Liaison Statement Management Tool a écrit :
[...]
SA2 would like to point out that among the four mechanisms for
address configuration delivery mentioned in your LS reply (i.e.
DHCPv4, DHCPv6, IPv6 ND and IKEv2) only the IPv6 ND mechanisms, and
in particular the Router Advertisement message, seem to be applicable
in the 5G System architecture in the specific context of Multi-homed
IPv6 PDU Sessions.
Please tell SA2 that current 4G cellular networks are specified to, and
do use to some extent, DHCPv6 Prefix Delegation to assign a prefix to an
end node like an IoT Router.
A /56 prefix delivered to the end node should have the same capabilities
as an address. We also want that /56 prefix to be more stable, or less
stable, etc.
I dont understand why 5G System architecture excludes DHCPv6 from the
list of applicable address configuration delivery.
I understand why 5G System architectures prefers ND - it is for addresses.
Alex
With respect to the following question in the IETF’s reply LS:
We also like to point out that, all though the LS statement
explicitly refers to both IPv4 and IPv6 address types, however it only mentions
about (RA) (IPv6
ND implied) as the mechanism for address property delivery. It
is to be noted that the approach of delivering coloring meta-data in RA
messages will most
likely be to limited to IPv6 address/prefix types and will not
be extended to IPv4 addresses. If this capability is required for IPv4, we may
have to possibly
extend DHCP protocol(s).
We request 3GPP to clarify if the Ask is explicitly for IPv6,
or if its for both IPv4 and IPv6 address/prefix types.
SA2 would like to clarify that the request is explicitly for IPv6. SA2
discussed the example documents that were referenced in your LS reply and
concluded that the following draft seems to be the most promising candidate for
the problem under discussion in this correspondence:
https://www.ietf.org/id/draft-feng-dmm-ra-prefixtype-01.txt.
SA2 would like to kindly ask IETF DMM working group to keep SA2 updated of the
work on the subject of including property meta-data in IPv6 ND address
assignment procedures for potential use in the 5G System to indicate the
mobility property of additional IPv6 prefixes assigned as part of the
Multi-homed IPv6 PDU Session functionality.
2 Actions
To IETF DMM working group:
ACTION: SA2 would like to kindly ask IETF DMM working group to keep SA2
updated of the work on the subject of including property meta-data in IPv6 ND
address assignment procedures for potential use in the 5G System to indicate
the mobility property of additional IPv6 prefixes assigned as part of the
Multi-homed IPv6 PDU Session functionality.
3 Dates of next TSG SA WG2 meetings
TSG SA WG2 Meeting 127 16 - 20 Apr 2018 Sanya, CN
TSG SA WG2 Meeting 127-Bis 28 May – 1 Jun 2018 Newport Beach, US
Attachments:
S2-182967_was2844_LS_IETF_SSC3
https://www.ietf.org/lib/dt/documents/LIAISON/liaison-2018-03-22-3gpp-tsgsa-sa2-int-6man-dmm-ls-on-indicating-service-continuity-usage-of-the-additional-ipv6-prefix-in-router-advertisement-attachment-1.docx
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