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I was wondering if someone knows a NAT64 software, preferably for windows.

This is because i need to communicate a only IPv6 service with a only IPv4 network without going to the Internet. The service cannot have IPv4 and on the network IPv6 cannot be implemented. That's why I need a translator, a NAT64 / DNS64.

Forefront UAG from Microsoft has a NAT64, it works for me. But i want to know if some of you know a free alternative.

Thank you.

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closed as not constructive by Chris S May 13 '13 at 19:14

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Teredo (built into Windows) doesn't do what you need? – Brian Knoblauch Aug 24 '11 at 19:12
Not. Teredo is a transition technologie for get a public IPv6 address when you are behind a NAT Device. This is not what I need in this case. I need a software that I put on a computer in the middle of a IPv4 network and IPv6 network and it translates. Thank you Brian. – Ricardo Polo Aug 24 '11 at 19:17
@Steve I'm telling my problem. "I need to communicate a only IPv6 service with a only IPv4 network. The service cannot have IPv4 and on the network IPv6 cannot be implemented. That's why I need a translator, a NAT64 / DNS64.". For being exactly i would like to implement Microsoft Direct Access in a network with not IPv6 capabilities, not even ISATAP. Thank you. – Ricardo Polo Aug 25 '11 at 4:34

4 Answers 4

up vote 4 down vote accepted

I only know of Linux or BSD based implementations. This is one with source and pre-built binaries for different Linux distributions:

It also offers a live CD, so maybe it's a solution for you if you run it in VirtualBox or VMware.

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Let's list out some options and try to get your feedback for each.

1) Teredo.

Provides connectivity to IPv6 hosts to IPv4 hosts. Built into Windows and hence very easy to deploy.

2) IPv6 SOCKS proxy

Sit the proxy on the IPv6 Internet and have one side sitting on your IPv4 intranet.

3) IPv6 HTTP proxy

You do not specify which protocols you require, if it is only HTTP then a HTTP proxy would be a valid solution.

4) SSH tunnel

You can implement an IPv6 SOCKS proxy simply with say PuTTY and a regular SSH server.

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Thank you for your answer. I know about the transitions technologies that you mention but none of them works for my everyroment. I'm looking for a NAT64 software. – Ricardo Polo Aug 25 '11 at 4:55
@Ricardo you still haven't answered why? I can only read between the lines and guess you have an IPv4-only application that you are trying to force into communicating with IPv6-only hosts. – Steve-o Aug 25 '11 at 5:13
I'm waiting for someone to knows a NAT64 implementation for Windows different to Microsoft UAG. If not my solution will be the one from Sander Steffan. Yes It's something like that but just the opossitive way. I have an only IPv6 application (Microsoft Direct Access) and i need it to communicate with an IPv4 network by an ethernet cable. The problems is that for some concerns of the IT area they cannot make the network IPv6 capable. I need to put something in the middle what makes the translations, even in the DNS queries. That is what NAT64/DNS64 does. Thank you. – Ricardo Polo Aug 25 '11 at 5:32

If you go to you can sign up for their IPv6 tunneling service which allows you to use AICCU to get a routable IPv6 address even if you're behind an IPv4 NAT.

This will let you access IPv6-only services from anywhere.

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Hello @MikeyB. Thanks for your answer. That it's not what I'm looking for. For that I have as example Teredo or the tunnel service that you mention. But it's not what I need. I need to communicate as example, two LANS, one which only can have IPv4 and one which only can have IPv6 and without going to the Internet. That's why I need use the protocol NAT64. – Ricardo Polo Aug 25 '11 at 5:17
@Ricardo, aha new information, add that to the question: "without going to the Internet". – Steve-o Aug 25 '11 at 5:26
@Steve Doing that. :) – Ricardo Polo Aug 25 '11 at 5:35
Then set up a proxy server (Squid) that has access to both networks. – MikeyB Aug 25 '11 at 21:01

Your question confuses me a bit, because you mention a IPv6-only service to be reached from IPv4-only clients, and then call it NAT64. But looking up NAT64 on wikipedia gives me the answer I expect: NAT64 is for IPv6-only clients to reach IPv4-only services.

The 'easy' answer I can think of for your question is setting up a dual-stack device on your network which translates a dedicated v4 address to the v6 destination and advertising the v4 address on your v4-only network for the service. I am not aware of a Windows approach to this (a windows server version may be able to do this). Linux/BSD can be configured to do this.

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Windows have native IPv6/IPv4 dual stack. But that is not what I need. For be clear I need to connect a Microsoft Direct Access Server (IPv6 only service) with a Network that only supports IPv4 and cannot install dual stack on that network. In the Microsoft world what a i need is a UAG Server, it has NAT64/DNS64. I put it in the middle of the server and the network and everything works. I was wondering if somenone knows a free alternative. – Ricardo Polo Sep 1 '11 at 20:16

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