Added IPv6 guide

how-to-disable-ipv6-on-ios-cellular-only-and-macos-and-why-it-s-a-big-deal-for-privacy/README.md

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+<!--
+Title: How to disable IPv6 on iOS (cellular-only) and macOS and why it’s a big deal for privacy
+Description: Learn how to disable IPv6 on iOS (cellular-only) and macOS and why it’s a big deal for privacy.
+Author: Sun Knudsen <https://github.com/sunknudsen>
+Contributors: Sun Knudsen <https://github.com/sunknudsen>
+Publication date: 2020-07-18T10:28:23.605Z
+-->
+
+# How to disable IPv6 on iOS (cellular-only) and macOS and why it’s a big deal for privacy
+
+[![How to disable IPv6 on iOS (cellular only) and macOS and why it’s a big deal for privacy - YouTube](how-to-disable-ipv6-on-ios-cellular-only-and-macos-and-why-it-s-a-big-deal-for-privacy.png)](https://www.youtube.com/watch?v=Nzx9T7GtmT4 "How to disable IPv6 on iOS (cellular only) and macOS and why it’s a big deal for privacy - YouTube")
+
+> Heads up: unfortunately this guide will not work on carriers or ISPs that have migrated their networks to IPv6-only.
+
+## iOS guide
+
+**Step 1 (macOS): download and open [Apple Configurator 2](https://support.apple.com/apple-configurator)**
+
+**Step 2 (macOS): create new profile using <kbd>cmd + n</kbd>**
+
+**Step 3 (macOS): configure "General" settings**
+
+![apple-configurator-general](./apple-configurator-general.png?shadow=1)
+
+**Step 4 (iOS): find your APN settings**
+
+Open "Settings", then "Cellular", then "Cellular Data Network".
+
+![ios-cellular-data-network](./ios-cellular-data-network.png?shadow=1&width=192)
+
+**Step 5 (macOS): configure "Cellular" settings**
+
+![apple-configurator-cellular](./apple-configurator-cellular.png?shadow=1)
+
+**Step 6 (macOS): save provisioning profile**
+
+**Step 7 (macOS): connect iPhone to Mac**
+
+**Step 8 (macOS): double-click on iPhone**
+
+![apple-configurator-iphone](./apple-configurator-iphone.png?shadow=1)
+
+**Step 9 (macOS): click on "Profile" tab, then "Add Profiles...", select saved provisioning profile and click "Add"**
+
+![apple-configurator-add-profile](./apple-configurator-add-profile.png?shadow=1)
+
+**Step 10 (iOS): review profile**
+
+Open "Settings", then "Profile Downloaded" and tap "Install"
+
+![ios-install-profile](./ios-install-profile.png?shadow=1&width=192)
+
+## macOS guide
+
+**Step 1: list network interfaces**
+
+```shell
+networksetup -listallnetworkservices
+```
+
+**Step 2: disable IPv6**
+
+```shell
+networksetup -setv6off "Wi-Fi"
+networksetup -setv6off "Thunderbolt Ethernet"
+```
+
+---
+
+## Want things back the way they were before following this guide? No problem!
+
+**Step 1 (iOS): remove provisioning profile from iPhone**
+
+Open "Settings", then "General", then "Profile", tap on your provisioning profile and tap "Remove Profile".
+
+![ios-remove-profile](./ios-remove-profile.png?shadow=1&width=240)
+
+**Step 2 (macOS): set network interfaces to automatic**
+
+```shell
+networksetup -setv6automatic "Wi-Fi"
+networksetup -setv6automatic "Thunderbolt Ethernet"
+```