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+title: Only IPv6 Only.
+---
+pub_date: 2020-03-04
+---
+author: ungleich
+---
+twitter_handle: ungleich
+---
+_hidden: no
+---
+_discoverable: no
+---
+abstract:
+In this article you will learn why it is beneficial for you to
+go IPv6 only instead of dual stack.
+---
+body:
+
+## TL;DR
+
+IPv6 is a solution to the address sparsity in legacy IP (IPv4).
+Only if you remove legacy IP, you really profit from IPv6.
+The good news is, this has become rather easy nowadays.
+
+## Current situation
+
+As of 2020-03-04, legacy addresses are hard to get and are becoming
+increasingly more expensive. In fact, almost
+[all 5 global IP address registries are out of legacy
+addresses](https://ipv4.potaroo.net/).
+
+What does that mean in layman's terms? If you are having one or more
+dedicated legacy IP addresses, your bills will go up in the near
+future. In fact, [google started increasing prices last year
+already](https://www.techrepublic.com/article/google-cloud-charging-for-ipv4-but-proper-ipv6-support-is-still-missing-in-action/).
+
+It is just a matter of time, until others have to follow.
+
+## Legacy IP world reachability
+
+One clarification just at the start: even if you go IPv6 only,
+**you can, will and want still legacy IP world reachability**.
+
+When you surf with your mobile phone, when your home or company
+accesses the Internet, you still need access to websites that are
+running on legacy IP.
+
+Also, if you are running a server, a virtual server, a website or any
+other service, you probably want to be reachable from legacy IP
+clients.
+
+Good news is: **you don't need a dedicated legacy IP address**.
+
+Neither to reach the legacy Internet, nor to be reachable.
+
+## History repeats
+
+You might remember that in the nineties, https-webservers required
+a dedicated **IP address per domain**. That's true, if **example.com**
+and **example.org** were both using SSL certificates, the webserver
+required at least 2 IP addresses. Later the SSL protocol was improved
+to allow domain names to share one IP address. Today one IP address
+can host hundreds or thousands of domains on a single IP address.
+
+With the shift from legacy IP to IPv6, we can use the same principle
+again. Instead of having a dedicated legacy IP address per service,
+**we can share legacy IP addresses**.
+
+## Dual Stack is not a solution
+
+Operating dual stack networks or services does not solve the problem,
+because it still uses legacy IP. In fact, the
+[US government mandates 80% IPv6 only networks by
+2025](https://www.theregister.co.uk/2020/03/03/us_government_ipv6/)
+([original
+website](https://www.cio.gov/assets/resources/internet-protocol-version6-draft.pdf)).
+For a good reason, because they want to reduce complexity. And costs,
+obviously.
+
+## Going IPv6 only
+
+This brings us to the main topic of this article: going IPv6 only.
+It is possible to IPv6 only, but still connect to the legacy
+Internet. But how does this work in practice?
+
+## Going IPv6 only with your static website
+
+It is very easy to create a static website on an IPv6 only webserver
+and have it reachable from IPv6 and the legacy Internet:
+you can either [create an IPv6 only virtual
+machine](../ipv6-only-hosting/), setup a webserver on it and use the
+
+## Going IPv6 only network
+
+## Going IPv6 only
+
+
+## Going IPv6 only bittorrent
+
+If you want to publish your open source software or publicly available
+data via bittorrent, you need can seed it from any IPv6 reachable
+computer. We provide an [IPv6 torrent tracker](../projects/ipv6-torrent-tracker/)
+
+
+
+## Who is profiting from IPv6 only vs. dual stack?
+
+
+
+## How does this affect me?
+
+
+
+## Short review
+
+Long story short, IPv6 was mainly introduced to fix the address
+sparsity issue in IPv
+
+## Dual stack setups
+
+
+
+introduced as
+
+##
+
+## The changes of IPv6 to the world
+
+In the next articles we will describe some real, practical changes of
+what we use and how we can work differently with IPv6. If you already
+have suggestions, we are happy to read them on **ipv6 at ungleich.ch**
+or on the [IPv6 Chat](https://IPv6.chat).
+
+Meanwhile, if you are
+interested in giving IPv6 only VPS a try, there is a 50% discount only
+until [Black IPv6
+Friday](https://swiss-crowdfunder.com/campaigns/black-ipv6-friday?locale=en).