Re: [v6ops] RFC6459 "IPv6 in 3GPP" - the IID in the LL address and GUA

[Alexandre Petrescu <[e-mail]>]

Le 14/07/2017 à 12:33, [e-mail] a écrit :
> See below with [HM] -----Ursprüngliche Nachricht----- Von: v6ops 
> [mailto:[e-mail]] Im Auftrag von Alexandre Petrescu 
> Gesendet: Mittwoch, 12. Juli 2017 14:04 An: Lorenzo Colitti Cc: 
> [e-mail] Betreff: Re: [v6ops] RFC6459 "IPv6 in 3GPP" - the IID 
> in the LL address and GUA
> 
> 
> I see it with tcpdump on a Sierra IoT module running a form of 
> embedded linux, gnueabi is the target of the cross compiler.  It
> uses /dev/ttyAT device.

> [HM] WWAN Modem Chipsets perform some kind of translation of packets,

This seems like a generalisation.  I do not understand what do you mean 
by WWAN Modem Chipsets - can you give an example of a WWAN Modem Chipset?

In my particular case there is no separated Modem Chipset from an 
Application Chipset, or App Processor vs. Broadband Processor, or 
something like that that one can find in many smartphones.  Or like 
Host-IMP distinciton of early RFCs.

In my case it is an IoT device.  It is called an "integrated module" and 
it runs linux.  It is from Sierra, format CF3, series WP8.

There is only one module running both linux and the cellular interface.

> especially ICMPv6 packets, between the interface to the computer and
> the interface towards the provider network. The reason is that the
> computer wants to see an Ethernet broadcast interface, but the
> provider interface is point-to-point. For example, the computer needs
> Neighbor Discovery but this is not available on the provider
> interface. The provider's network device doesn't have a MAC address
> either, so the modem chipset emulates this missing MAC to the
> computer.

Do you think it is a linux kernel module that performs that emulation, 
or is it completely another OS (like ThreadX)?

That emulation must be standardised.

> So what you capture on WWAN0 (or however your computer interface is 
> named) is not what actually goes over the air.

If you think that something else goes over the air, can you tell me how, 
or what capturing tool, did you find out that there is something else 
over the air?

My operator asks me the same thing - what goes over the air - and I dont 
know what to answer.

Alex


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