Open Infrastructure

h1. How to disable IPv4 on your website

{{toc}}

h2. Status

This document is *IN PROGRESS*.

h2. Introduction

This article is for you, if you want to only allow IPv6 traffic to

your website or some parts of your website. This article is also for

you if you are running a website on an IPv6 only webserver / VM.

h2. IPv6 only webservers

If you are running an IPv6 only webserver, IPv4 clients cannot reach

you. They will be presented with an error message from the

browser.

This is clearly not an expected behaviour and your visitors will

likely be confused.

To solve this problem, you can add a DNS "A" entry for your website

pointing to 185.203.114.115. IPv4 only visitors will then be presented

with the content of https://no-ipv4-here.ungleich.ch/ that explains to

them that they need IPv6 to visit your website.

h3. Summary

If you want to help IPv4 visitors to visit IPv6 only websites, you can

add a DNS A entry pointing to 185.203.114.115. Below is the example

code for the BIND DNS server:

<pre>

; The first one should already be present

example.com. IN AAAA your:ipv6:address::

; This one allows visitors to get a hint

example.com. IN A 185.203.114.115

</pre>

h2. Disabling IPv4 traffic on (parts of) your website

If you are running a Dual Stack website (reachable by IPv6 and IPv4)

and you want to disable IPv4 traffic, you can redirect the user to

http://no-ipv4-here.ungleich.ch?back_to=https://www.example.com/your-url.

h3. Sample nginx configuration for disabling IPv4 traffic

Assuming that you want to disable 

<pre>

geo $iptype {

    0.0.0.0/0 ipv4;

}

server {

    ...

    location ~* ^/ipv6/work/(login|logout|signup|jobs)/(.*)$ {

       if ($iptype) {

           return 302 https://no-ipv4-here.ungleich.ch/?back_to=$scheme://$host$uri;

       }

       proxy_pass https://www-server.ipv6.work/$1/$2;

    }

    ...

}

Checkout our

"blog  entry":https://ungleich.ch/en-us/cms/blog/2019/01/27/how-to-distinguish-ipv6-and-ipv4-traffic-with-nginx/

for more information about the nginx configuration.