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At my researching time, I found these relevant topics: access ipv6 website over ipv4 network and IPv6 Webserver reachable for IPv4 only Clients.

My situation: I have a public ipv6 and a local ipv4 at home. I tried hard to forward a port, but it looks like I'm into a NAT, behind another NAT (?). So I tried to reach my ipv6 address outside my LAN and I got success, so then I set a simple apache webserver on a raspberry pi (who has an ipv6 too) and expose it to different DNS providers: dioniso.ddns.net, dioniso.crabdancer.com and dioniso.dynv6.net.

So, I can access these websites only in PCs that have ipv6 or ipv4 with tunneling.

The thing is, how ipv4 could reach this website? Some topics are saying that I need a proxy to "translate" ipv6-ipv4. Is it really necessary? If yes, where can I found a provider to do that?

Could someone give me some tips here? I'm pretty lost.

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Yes, if your webserver has only IPv6 and the visitor has only IPv4 then they will not be able to communicate. You'd need a translator that has access to both IPv4 and IPv6 somewhere.

There are roughly two ways to translate:

  • Reverse proxy
  • SIIT-DC

Facebook uses SIIT-DC in their server farms. They use IPv6 internally and use SIIT-DC to translate their incoming IPv4 traffic to IPv6. I don't know of any providers that offer such a service for home use though.

What you could do is to rent a virtual private server with both IPv4 and IPv6 somewhere and set up a reverse proxy on it. Then visitors can contact the server over IPv4, and the server can contact your webserver over IPv6. I have done this in the past with Apache, Nginx and haproxy. The configuration is not too difficult, but you do need to have a server that you can run it on...

I wrote an article on options for making IPv4 content accessible over IPv6. What you need is basically the reverse: making IPv6 content accessible over IPv4. The concept is the same though.

A simple haproxy config:

listen webserver1
    bind 192.0.2.1:80
    mode tcp
    server webserver1 2001:db8:abc:123::cafe:80
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Many thanks to Sander, his answer guides me to this solution:

At Raspberry IPV6 website, just set apache to listen port: 666

At my VPS with a public IPV4, installed socat on it and ran this command:

socat TCP4-LISTEN:666,fork,su=nobody TCP6:[raspberrypi_ipv6_address]:666

So all incoming data from IPV4 port 666 will be redirected to my IPV6 port 666.

Its not the professional way to do it, but works for me!

  • Thank you for documenting an alternative solution. Others with the same question may find having multiple solutions documented very useful when deciding what is the best option for them :) – Sander Steffann Oct 23 '17 at 20:12

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