Re: [v6ops] I-D Action: draft-ietf-v6ops-mobile-device-profile-17.txt - DHCP-PD

jouni korhonen <jouni.nospam@gmail.com> Thu, 19 February 2015 20:30 UTC

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Date: Thu, 19 Feb 2015 12:30:37 -0800
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From: jouni korhonen <jouni.nospam@gmail.com>
To: Ross Chandler <ross@eircom.net>
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Cc: "v6ops@ietf.org" <v6ops@ietf.org>, Kossut Tomasz - Hurt <Tomasz.Kossut@orange.com>
Subject: Re: [v6ops] I-D Action: draft-ietf-v6ops-mobile-device-profile-17.txt - DHCP-PD
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I still fail to see how EIT setting relates to IPv6 as a requirement.  It
is a normal procedure when the UE wants to connect (during the initial
attach) to another APN than the default one.

- Jouni

On Wed, Feb 18, 2015 at 12:48 PM, Ross Chandler <ross@eircom.net> wrote:

>
> On 18 Feb 2015, at 16:47, jouni korhonen <jouni.nospam@gmail.com> wrote:
>
>
>
> On Wed, Feb 18, 2015 at 4:57 AM, Alexandru Petrescu <
> alexandru.petrescu@gmail.com> wrote:
>
>> Hi,
>>
>> Le 18/02/2015 12:13, Kossut Tomasz - Hurt a écrit :
>>
>>> Hi,
>>>
>>> Inline comments:
>>>
>>> Hi,
>>>
>>> Thank you for the report. It is good to see how good consideration
>>> is given to IPv6, and the two separated paths IPv4/IPv6.
>>>
>>> It is encouraging to see numerous smartphone manufacturers having
>>> embraced the CLAT technology.
>>>
>>> (tk) - this is not only CLAT, (CLAT is in generic Android thanks to
>>> Lorenzo, Cameron, Dan & others) each vendor has its own
>>> customization based on MCCMNC/region to control "features" per
>>> operator. In our case we have :  dedicated clatd.conf (not generic
>>> one), IPv6 tethering(DHCPv6, RA, Relay IPv6 DNS)
>>>
>>
>> It's good to see these mentioned.
>>
>> For tethering - is the network offering DHCPv6 Prefix Delegation
>> service?  Or is the device performing '64share' RFC7278?
>>
>> There are some advantages on doing the former rather than the latter.
>>
>>  EIT bit =1,
>>>
>>
>> What is the EIT bit?
>>
>
> My wild guess is that it is the ESM information transfer flag bit in the ESM
> information transfer flag information element. If it is, it does not really
> have anything to do with IPv6 IMHO.
>
> - Jouni
>
>
> As far as I can tell from a previous answer on v6ops by Orange PL the EIT
> bit (think it is ESM info transfer flag IE) has an effect when the HSS has
> a default APN different from the one requested by the UE.  Without the EIT
> bit set the network doesn’t let the UE requested APN override the default
> from the HSS, so two PDN connections are set up, one with IPv4 (assuming
> the default is an IPv4 only APN) and the other IPv6 (assuming that was
> requested by the UE).  So strictly speaking it does look independent of IP
> version but it is being noticed as operators introduce IPv6.
>
> Ross
>
>