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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>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.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Does Windows possibly have a requirement that the advertised prefix only be a /64 in order for SLAAC to work?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Frank<o:p></o:p></p></div></body></html>