Acceptable prefix sizes for Windows Vista/7

Frank Bulk frnkblk at
Wed Feb 16 06:16:18 CET 2011

I was testing a residential broadband router's implementation of IPv6 and
found that it wasn't using the first /64 in the delegated prefix, but the
whole /56.  And my Windows 7 machine wasn't getting an IP address.  Switched
the LAN interface of the router to stateful DHCPv6 and I could get an IP.


Does Windows possibly have a requirement that the advertised prefix only be
a /64 in order for SLAAC to work?



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