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IPv6 supports a 128-bit addressing scheme, which lets it support an order-of-magnitude more devices that are directly connected to the Internet than its predecessor, IPv4. IPv6 also has autoconfiguration, end-to-end security and other enhancements.

Vista supports IPv6 by default. Vista runs a single-stack, dual-IP-layer architecture, which means it is IPv4- and IPv6-capable out of the box. It supports tunneling of IPv6 traffic over an IPv4 backbone and includes IPSec that works for both IPv4 and IPv6.

Network management software vendors and users are reporting problems with Vista’s IPv6 implementation.

“Vista is showing some serious deficiencies around IPv6 and IPv4 insofar as their compliance or the transparency of their compliance around IP behaviors,” says Loki Jorgenson, chief scientist for Apparent Networks, a provider of network assessment and optimization tools.

“For example, Vista doesn’t expose any of the [Internet Control Message Protocol] errors to applications running on Vista,” Jorgenson says. “The application can’t get access to that message, and subsequently all it sees is that the network connection is not working. This is a big challenge for us around Vista. It’s not clear at all why IPv6 isn’t properly supported in this regard.”

Duane Murphy, president of Managed Information Services in Long Beach, Calif., says he has experienced problems with Vista’s IPv6 implementation on the networks he runs for law firms. Murphy used Network Instruments' Observer 12 application, which supports IPv6, to isolate Vista’s IPv6 problems.

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