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Re: [v6ops] Apple and IPv6, a few clarifications - ND proxy for bridging hotspots

james woodyatt <jhw@nestlabs.com> Wed, 24 June 2015 18:38 UTC

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From: james woodyatt <jhw@nestlabs.com>
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Date: Wed, 24 Jun 2015 11:38:06 -0700
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References: <E1C235B5-1421-4DAF-A2F3-F963982233DF@apple.com> <1599CF94-9B35-4858-AD52-6FADC8F25671@apple.com> <558ABAC3.4010802@gmail.com>
To: Alexandru Petrescu <alexandru.petrescu@gmail.com>
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Subject: Re: [v6ops] Apple and IPv6, a few clarifications - ND proxy for bridging hotspots
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On Jun 24, 2015, at 07:12, Alexandru Petrescu <alexandru.petrescu@gmail.com> wrote:
> 
> […] In the car use-case the smartphone connects to the dashboard using a ptp
> link.  And it's the car's dashboard which offers a WiFi hotspot.  These
> couldn't be bridged (ND proxy) by the smartphone alone, it would need
> the dashboard router to participate in this ND proxy. […]

I suspect the point you may be missing here is the logic encoded elsewhere in iOS that restricts the use of Mobile Internet Sharing to the telephony uplink. It is not possible with iOS to share Internet access over the Wi-fi (or other interfaces) with tethered devices. Only the telephony data service is eligible for Mobile Internet Sharing.

Shorter james: the automotive Wi-fi hotspot use case is like every other Wi-fi hotspot as far as iOS is concerned, i.e. every phone on Wi-fi is an ordinary host and not a ND proxy or a router.

—james

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