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Simon Willison’s Weblog

Imminent Death of the Net Predicted. Well, maybe not, but the way Windows Vista deals with round-robin DNS A records (using a new IPv6 algorithm from RFC3484 backported to IPv4) means that domains that serve up multiple A records to load balance between data centres will find that the IP nearest to the 192.168.* range will get the vast majority of Vista traffic.

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3 comments

  1. This is why a good systems engineer shouldn't rely on clients do do effective load balancing.

    Chris Kelly - 5th March 2009 14:49 - #

  2. *yawn* IPv4 isn't even exausted yet, nobody is going to switch on mass until it becomes more expensive to buy unused IPv4 IPs than the cost of implementing IPv6.

    The tipping point is still 8 years away at best.

    Multiple A records should be used for redundancy and choosing the best route not load balancing.

    Dave K - 5th March 2009 16:28 - #

  3. The strongest argument I've heard for IPv6 adoption is that right now there are people in China that are accessing the internet from behind 13 layers of NAT. Asian countries with large populations and tiny IPv4 address range allocations have a very strong incentive to move to IPv6, and will pull the rest of us along with them.

    IPv6 adoption isn't relevant here though, as the described problem with Vista affects IPv4.

    Simon Willison - 5th March 2009 17:25 - #

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