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These are all posts about IPv6. Archive for 2012.

IPv6 in operating systems since my book was published

I sometimes get the question whether my book "Running IPv6" is still current. Since publication in 2005, not much has changed with regard to the core IPv6 protocols. I may go over what's new in this regard at some point in the future. However, what has changed significantly are the operating systems and other software mentioned in the book. The main things to be aware of are:


In Windows XP, IPv6 is a protocol separate from IPv4 that must be installed explicitly. In Windows Vista and Windows 7, IPv6 support is integrated with IPv4 and enabled by default. Vista/7 use something other than the system's MAC address as the interface identifier in link local addresses and stateless autoconfiguration. Unlike XP, Windows Vista and Windows 7 support DHCPv6 for both address configuration and to learn DNS resolver addresses.


In MacOS 10.7 Apple enabled privacy addresses with stateless autoconfig by default and added DHCPv6 support for address configuration and to learn DNS resolver addresses. Also, the system tries looks at the round trip time towards a destination over IPv6 and IPv4, and will use the protocol that has the lowest RTT. So MacOS 10.7 will often connect over IPv4 to destinations that have both IPv4 and IPv6 in the DNS. This makes things harder to debug, but the upside is that it avoids timeouts with broken IPv6 setups. As of 10.6.5 MacOS will prefer IPv4 over IPv6 if it has 6to4 connectivity.


The iPhone, iPod touch and iPad didn't exist yet in 2005. IPv6 support was added for these devices in iOS 4 and is relatively mature in iOS 5, with stateless autoconfig and privacy addresses as well as DHCPv6 support. It looks like iOS 5 also uses the RTT-based IPv4/IPv6 selection mechanism present in MacOS 10.7.


The DHCP software mentioned in the book is quite bad. A much better option is the ISC dhcpd, which now also supports IPv6.

Permalink - posted 2012-02-20

→ The future is forever: the state of IPv6 in the Apple world

The new Internet is upon us. Apple has work to do but there's no reason to fear.

Read the article - posted 2012-05-21

→ World IPv6 Launch gets 27 percent of pageviews on IPv6

Today, the four biggest websites (and 3,000 smaller ones) again enabled IPv6.

Read the article - posted 2012-06-06

NAT64 @ World IPv6 Launch

My presentation slides for my lightning talk about NAT64 at the World IPv6 Launch event in Amsterdam.

Read the article - posted 2012-06-06

→ Europe officially runs out of IPv4 addresses

RIPE NCC now allocating IPv4 address space from the last /8 netblock

Read the article - posted 2012-09-14

→ IPv4 address transfer markets are forming where we least expected

As IPv4 addresses run out, regions have very different fixes in mind.

Read the article - posted 2012-09-21

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