Re: [dhcwg] MTU option for DHCPv6?


Le 29/07/2016 à 17:14, Alexandre Petrescu a écrit :
>
>
> Le 29/07/2016 à 16:20, Lorenzo Colitti a écrit :
>> On Fri, Jul 29, 2016 at 2:27 AM, Alexandre Petrescu
>> <alexandre.petrescu@gmail.com
>> <mailto:alexandre.petrescu@gmail.com>> wrote:
>>
>> Alexandre, that doesn't make sense. The only specified mechanism
>> for IPv6 on 3GPP links is RAs.
>>
>>
>> I would doubt so.  I think DHCPv6 is there in the 3GPP specs too.
>>
>>
>> DHCPv6 PD (only) was added in release 10. SLAAC has been there for
>> at least a decade, I think.
>>
>>
>> There is no Ethernet on cellular links, where did you get that
>> from?
>>
>>
>>> From packet dumps, looking at the headers.
>>
>>
>> Just because the driver of a device you own pretends that the 3GPP
>>  link is an Ethernet link doesn't mean that there's Ethernet on the
>>  air.
>
> I agree, there may be no Ethernet headers in the air of cellular
> links.
>
> But there is an additional indicator.  Companies like Huawei and
> Sierra have requested and paid for IEEE OUI numbers that they use to
> form MAC addresses on cellular links (Huawei E392 4G LTE dongle,
> Sierra Wireless Airprime module).  These IEEE OUI numbers and MAC
> addresses are obviously not part of 3GPP specs either, yet they are
> there printed on the boards, in the driver, etc.  I suspect these
> MAC addresses do get sent over the air on cellular links.
>
> Add to this that in some cases this is on USB too.
>
> This is completely unspecified behaviour (no IPv6-over-USB, no 3GPP
> specs mention IEEE addressing, etc).
>
>> Look at an Android phone and you'll see something completely
>> different - no Ethernet address and a different ARPHRD_xxx value.
>
> Somehow I dont understand ARPHRD_xxx value.
>
> I wonder what chipset the Android phone in question uses to
> communicate on cellular?
>
> I am asking because I just got hold of a brand new Huwaei Mate 8
> phone running Androing,
                         ^^H^Hd (Android)

> and I still have to figure whether this uses these Huawei IEEE OUI
> MAC addresses on cellular links (like the Huawei dongle does).
>
>> It is a bug when the Host configures so many IPv6 addresses on its
>>  interface.  It's looking like getting out of hand.
>>
>>
>> RFC 7934 claims the opposite.
>
> This is an excellent RFC that makes it an excellent case to deliver
> many addresses to Host, instead of just one.
>
> But there are a couple of ways to satisfy that requirement (give more
> addresses to a Host) and one of the ways is pretty bad.  RA a /64 to
> a Host is not the right way to deliver many addresses to a Host.
>
> Unless you agree that a Prefix Delegation during RA operation may be
> a good idea?
>
> Alex
>
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