Neil H Watson, Linux consultant

My email server now functions on both IPV4 and IPV6 networks. Postfix is IPV6 ready but, the configuration needed some adjustments.

In places like mynetworks, found in main.cf, IPV6 addresses must be enclosed in square brackets. This does not include the netmask. For example: [::1]/128

In main.cf Postfix is told to use IPV6 using inet_protocols. Set this to all and Postfix will listen to IPV4 and IPV6 interfaces.

For more information about Postfix and IPV6 the Postfix web page

In fact a lot of configuration files have special rules to accommodate IPV6 addresses because IPV6 syntax was not a consideration when the configuration syntax was first invented. Read configuration documentation carefully.

This website is now dual stacked to both IPV4 and IPV6. In part four of my IPV6 series I'll tell you what I learned during this migration.

We continue in this series by having a quick look at a dual stack VPS host.

In this part of the series we will learn how to make a service run on an IPV6 address.

The first step in my exploration of IPV6 was to get an IPV6 address via an IPV4 to IPV6 tunnel. A little research lead me to the fine folks at SixXS.

In the coming weeks or months I will be posting my experiences testing IPV6 and hopefully migrating to IPV6 Internet services, including this website. I hope you will return here and learn from my experiences.