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_drafts: finish ipv6
ref: #64 which is not fixed until this is released and also [CI SKIP].
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@ -18,8 +18,8 @@ The comments of that post are also totally lost.
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## IPv4
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It's probably start with what is wrong with IPv4 and note that all modern
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operating systems (including Windows 7 and newer) are designed to work with
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IPv6 and disabling it may break some features.
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operating systems (including Windows Vista and newer) are designed to work
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with IPv6 and disabling it may break some features.
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There are no IPv4 addresses for everyone and that is why we have NATs in
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routers so we only have one IPv4 address facing the internet. That isn't
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@ -102,3 +102,80 @@ As I am talking so much about privacy extensions, I must probably tell
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that you can disable them if you want. I have no idea if that is possible
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with OS X so I don't say anything about it, I only know that it uses them
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by default.
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Windows: start by disabling the randomization and then
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```
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netsh interface ipv6 set privacy state=disabled store=active
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netsh interface ipv6 set privacy state=disabled store=persistent
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```
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Linux: check NetworkManager or whatever you use config files
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(or connection editor) or use the
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kernel option directly in `/etc/sysctl.conf` or preferably
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`/etc/sysctl.d/<whatever>.conf`: `net.ipv6.conf.default.use_tempaddr=0`.
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The numbers you can use here are:
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* 0 — IPv6 Privacy Extensions are disabled.
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* 1 — IPv6 Privacy Extensions are enabled, but **SLAAC-address is
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preferred.**
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* 2 — IPv6 Privacy Extensions are enabled and preferred. This is usually
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the default and what you should use.
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### Getting IPv6
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For native connectivity I only know about Finland (links in the list in
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Finnish)…
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* [IPv6 in Finnish consumer connections](http://ape3000.com/ipv6/)
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* At the time of writing Elisa and DNA which are two of three biggest
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carriers (Sonera is missing) have IPv6 in all mobile connections, DNA
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has IPv6 also in broadband connections and Elisa is working on it
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and Sonera has 6rd.
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* [Elisa's page on enabling IPv6](http://asiakastuki.elisa.fi/ohje/541)
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* [DNA's page on IPv6](https://www.dna.fi/ipv6)
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* [DNA's instructions for enabling IPv6 on different devices](https://www.dna.fi/ipv6-laitteet)
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…but I can suggest searching the web for `yourISP IPv6` and contacting
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their customer support asking when they are going to enable IPv6.
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For tunneling there are multiple services, but I am only going to mention
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Teredo shortly, it's the protocol of last resolt for accessing IPv6 sites
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and Windows comes with it by default. The easiest way to enable it is
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probably saving the following as `something.reg` and running it:
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```
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Windows Registry Editor Version 5.00
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[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Dnscache\Parameters]
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"AddrConfigControl"=dword:00000000
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[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\TCPIP\v6Transition]
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"Teredo_DefaultQualified"="Enabled"
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"Teredo_State"="Enterprise Client"
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"Teredo_ServerName"="teredo.trex.fi"
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```
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Short explanation:
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* Enable looking up IPv6 records even with Teredo
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* Enable Teredo…
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* …even if we are in domain
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* use teredo.trex.fi as Teredo server, you might want to use some server
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that is more [near to you](https://en.wikipedia.org/wiki/Teredo_tunneling#Servers).
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Linux: install package `miredo` and edit the server in `/etc/miredo.conf`
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if needed.
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And then check [ipv6-test.com](http://ipv6-test.com) and it should detect
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your Teredo connectivity. Some browsers don't even attempt to use it, at
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least I think Google Chrome did so.
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## Further reading
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* [Wikipedia's page on IPv6](https://en.wikipedia.org/wiki/IPv6)
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* [Wikipedia's page on Teredo](https://en.wikipedia.org/wiki/Teredo_tunneling)
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* [Microsoft Technet: A 5 Second Boot Optimization If You’ve Disabled IPv6 on Windows Client and Server by setting DisabledComponents to 0xFFFFFFFF](http://blogs.technet.com/b/askpfeplat/archive/2014/09/15/a-5-second-boot-optimization-if-you-ve-disabled-ipv6-on-windows-client-and-server-by-setting-disabledcomponents-to-0xffffffff.aspx)
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* TL;DR: depending on how you disabled IPv6 your boot might be 5
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seconds lower and Microsoft discourages disabling it and they don't
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test working without IPv6. Disabling IPv6 breaks e.g. HomeGroup.
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