Re: [v6ops] draft-ietf-v6ops-ipv6-roaming-analysis WGLC

2014-07-28 15:15 GMT+08:00, Mikael Abrahamsson <swmike@swm.pp.se>:
> On Sun, 27 Jul 2014, fred@cisco.com wrote:
>
>> This is to initiate a two week working group last call of
>> http://tools.ietf.org/html/draft-ietf-v6ops-ipv6-roaming-analysis.
>> Please read it now. If you find nits (spelling errors, minor suggested
>> wording changes, etc), comment to the authors; if you find greater
>> issues, such as disagreeing with a statement or finding additional
>> issues that need to be addressed, please post your comments to the
>> list.
>>
>> We are looking specifically for comments on the importance of the
>> document as well as its content. If you have read the document and
>> believe it to be of operational utility, that is also an important
>> comment to make.
>
> I have re-read the document. I still find it useful. However, when reading
> it I can't help of feeling that this document isn't ready for publication
> yet. It definitely needs a do-over when it comes to language and spelling.
>
> Also, on the technical side, I feel the document could be clearer, but I
> don't know exactly how. I know my comment here isn't really helpful, apart
> from saying that the document might need more work.
>
> One thing that came to mind though, would be a section on how to best
> provision users in HLR. At least one vendor I know of, doesn't support
> setting "IPv4v6" on a user in their HLR. In order to support all cases of
> "IPv4", "IPv6" and "IPv4+IPv6" (dual bearer) and "IPv4v6", one needed to
> give the user two profiles, one being IPv4+ext_pdp IPv6, and also
> IPv6+ext_pdp, otherwise the user couldn't connect using IPv6 only.

Only the value IPv4v6 is allowed for ext_pdp. If HLR doesn't support
IPv4v6 setting(that is the most case pre-R9), in other words, it can't
set ext_pdp. It may not able to support all cases.

I guess one way to provision users if HLR can suppor ext_pdp:

two profiles:

#1:

  PDP-Context ::= SEQUENCE {
	pdp-ContextId	ContextId,
	pdp-Type		PDP-Type, IPv4 & IPv6
	pdp-Address	PDP-Address	OPTIONAL,
  ....
	apn-oi-Replacement	APN-OI-Replacement	OPTIONAL,
	-- this apn-oi-Replacement refers to the APN level apn-oi-Replacement and has
	-- higher priority than UE level apn-oi-Replacement.
	ext-pdp-Type	Ext-PDP-Type	OPTIONAL,
	-- contains the value IPv4v6 defined in 3GPP TS 29.060 [105], if the PDP can be
	-- accessed by dual-stack UEs
	ext-pdp-Address	 PDP-Address	OPTIONAL,
	-- contains an additional IP address in case of dual-stack static IP
address assignment
	-- for the UE.
	-- it may contain an IPv4 or an IPv6 address/prefix, and it may be present
	-- only if pdp-Address is present; if both are present, each parameter shall
	-- contain a different type of address (IPv4 or IPv6).
  ...
	 }

#2:

  PDP-Context ::= SEQUENCE {
	pdp-ContextId	ContextId,
	pdp-Type		PDP-Type, IPv4 & IPv6
	pdp-Address	PDP-Address	OPTIONAL,
  ....
	apn-oi-Replacement	APN-OI-Replacement	OPTIONAL,
	-- this apn-oi-Replacement refers to the APN level apn-oi-Replacement and has
	-- higher priority than UE level apn-oi-Replacement.
	 }

HLR sends ISR with #1 to vSGSN that above R9; otherwise, it sends #2
to vSGSN that is pre-R9

BRs

Gang

> --
> Mikael Abrahamsson    email: swmike@swm.pp.se
>
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