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How to disable IPv4 on your website » History » Revision 3

Revision 2 (Nico Schottelius, 02/05/2019 03:35 PM) → Revision 3/7 (Nico Schottelius, 02/05/2019 03:42 PM)

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. TL;DR 

 * For IPv6 only servers add an DNS A entry to 185.203.114.115. 
 * For Dual stack servers redirect to to https://no-ipv4-here.ungleich.ch/?back_to=https://your-page-here/your-path 

 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. Dual Stack Webserver: 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. 

 h3. Changing / Modifying no-ipv4-here.ungleich.ch 

 If you want to make changes to the website, you can access the source code of it on https://code.ungleich.ch/ungleich-public/ungleich-no-ipv4-here and submit changes to it.