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

james woodyatt <> Wed, 24 June 2015 18:38 UTC

Return-Path: <>
Received: from localhost ( []) by (Postfix) with ESMTP id 610821ACEDC for <>; Wed, 24 Jun 2015 11:38:10 -0700 (PDT)
X-Virus-Scanned: amavisd-new at
X-Spam-Flag: NO
X-Spam-Score: -2
X-Spam-Status: No, score=-2 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, HTML_MESSAGE=0.001, SPF_PASS=-0.001] autolearn=ham
Received: from ([]) by localhost ( []) (amavisd-new, port 10024) with ESMTP id nl9fIUAvUfXQ for <>; Wed, 24 Jun 2015 11:38:09 -0700 (PDT)
Received: from ( [IPv6:2607:f8b0:4001:c05::230]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by (Postfix) with ESMTPS id E97691ACED8 for <>; Wed, 24 Jun 2015 11:38:08 -0700 (PDT)
Received: by igbqq3 with SMTP id qq3so121099936igb.0 for <>; Wed, 24 Jun 2015 11:38:08 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=google; h=content-type:mime-version:subject:from:in-reply-to:date:cc :message-id:references:to; bh=4uKSU/spXdXmTU9z4+85Ha5Y6sjqtFj4DekrLUApg2A=; b=GVfOQ/YfVlUDir3ZFiVpDGJWxnQ6aYz0wc8oYT3aMtq2qrodeKkgK5wmDtOCXKR1pp 9Mj+g9QGYS6gIYohMeo+8H1Qvm/i374x0fiohcU429XARtL2EdYQG1q24fjVsQ+9T02N ll/7ryQug+Pt3wC7pZh7eTUvHv2ntj3yrksrY=
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=20130820; h=x-gm-message-state:content-type:mime-version:subject:from :in-reply-to:date:cc:message-id:references:to; bh=4uKSU/spXdXmTU9z4+85Ha5Y6sjqtFj4DekrLUApg2A=; b=X6vGARBHkpBX9OvkjaBKJvNiFt17ttj/U2/qR6FgAHA0QNA+HO7wAkZE21y8BkVXpm eZ+dgwVMOvOBc3PXAtctVWpZaoIm1VQ9yUDUMrdHRxQMDtEMnMrxxwRf1vU0w0XrVdI5 OklO8zfPsc5RRDVyPDy80B1Ic9utyrKyakDTAMN2n2W3q2mrmwgeXy/tKTUFaEmvPhkz 7RSpojFgIfgg3jRUn3hH270or2V36CFCerh89db8bYwQF9nbZDGKXbLQfL/pTTNnX4qN R3pv2BJn7WAAFdntq7t34RH8wnFZUBgn8+pAcWHLrGxf+J6xojfZqpJSoYJ2EhSNBzAy WX4w==
X-Gm-Message-State: ALoCoQkMGCRy9XsNVm5qkdBj4O71+ToPAwIzkpWxby64ofKM/zzhfnt4KMAi+z8DqyWYW6v9xpMe
X-Received: by with SMTP id d5mr39300645icm.44.1435171088399; Wed, 24 Jun 2015 11:38:08 -0700 (PDT)
Received: from ([]) by with ESMTPSA id p39sm17829774ioi.5.2015. (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 24 Jun 2015 11:38:07 -0700 (PDT)
Content-Type: multipart/alternative; boundary="Apple-Mail=_673B5579-61FF-4A7A-88AE-CE9EC196336E"
Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2098\))
From: james woodyatt <>
In-Reply-To: <>
Date: Wed, 24 Jun 2015 11:38:06 -0700
Message-Id: <>
References: <> <> <>
To: Alexandru Petrescu <>
X-Mailer: Apple Mail (2.2098)
Archived-At: <>
Subject: Re: [v6ops] Apple and IPv6, a few clarifications - ND proxy for bridging hotspots
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: v6ops discussion list <>
List-Unsubscribe: <>, <>
List-Archive: <>
List-Post: <>
List-Help: <>
List-Subscribe: <>, <>
X-List-Received-Date: Wed, 24 Jun 2015 18:38:10 -0000

On Jun 24, 2015, at 07:12, Alexandru Petrescu <> 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.