IPv6 newbie setting up a new system and want to include private IPv6 networking. 3 WS2008 R2 machines on the network so far; 2 member servers and 1 DC/GC/DNS/DHCP. IPv4 is working correctly. DC has a static IPv6 address & DNS; the member servers are DHCP Reservations. All machines share the same CID. DHCP is stateful. DHCP clients are picking up their IPs and registering them with DNS. Seems like that's all I'd need...but I can't "PING -6" between any of the machines by name or address. Not a firewall issue; I've turned off the firewall for testing. I'm sure I'm missing something very fundamental but I've not figured out what it is...any ideas? IPCONFIG /ALL for the relevant interfaces follow: IPCONFIG /ALL from the DC: Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : company.local Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet Physical Address. . . . . . . . . : 00-15-C5-E2-E2-44 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . . . . . . . . . : fdf1:162d:cbfa:9f2b:1cd1::10(Preferred) IPv6 Address. . . . . . . . . . . : fdf1:162d:cbfa:9f2b:f17d:c651:2623:973(Pr eferred) Lease Obtained. . . . . . . . . . : Sunday, February 27, 2011 11:49:54 PM Lease Expires . . . . . . . . . . : Friday, March 11, 2011 11:49:53 PM Link-local IPv6 Address . . . . . : fe80::1cb0:601a:27b8:4ed6%21(Preferred) IPv4 Address. . . . . . . . . . . : 10.100.10.10(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.100.10.1 DHCPv6 IAID . . . . . . . . . . . : 352327109 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-EE-3D-51-00-15-C5-E2-E2-44 DNS Servers . . . . . . . . . . . : fdf1:162d:cbfa:9f2b:1cd1::10 ::1 10.100.10.10 127.0.0.1 NetBIOS over Tcpip. . . . . . . . : Enabled Connection-specific DNS Suffix Search List : company.local IPCONFIG from Member Server 1-- Ethernet adapter Console NIC: Connection-specific DNS Suffix . : company.local Description . . . . . . . . . . . : Broadcom BCM5708C NetXtreme II GigE (NDIS VBD Client) Physical Address. . . . . . . . . : B8-AC-6F-82-AC-FD DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . . . . . . . . . : fdf1:162d:cbfa:9f2b:1c31:2000:0:41(Prefer red) Lease Obtained. . . . . . . . . . : Monday, February 28, 2011 10:15:54 AM Lease Expires . . . . . . . . . . : Saturday, March 12, 2011 10:15:55 AM Link-local IPv6 Address . . . . . : fe80::9d32:9b8c:f38e:626b%21(Preferred) IPv4 Address. . . . . . . . . . . : 10.100.10.40(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.0.0 Default Gateway . . . . . . . . . : 10.100.10.1 DHCPv6 IAID . . . . . . . . . . . : 364424303 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-EF-9A-6C-B8-AC-6F-82-AC-FD DNS Servers . . . . . . . . . . . : fdf1:162d:cbfa:9f2b:1cd1::10 10.100.10.10 NetBIOS over Tcpip. . . . . . . . : Enabled Connection-specific DNS Suffix Search List : company.local IPCONFIG from Member Server 2-- Ethernet adapter Local Area Connection: Connection-specific DNS Suffix . : company.local Description . . . . . . . . . . . : Microsoft Virtual Machine Bus Network Ada pter Physical Address. . . . . . . . . : 00-15-5D-0A-CB-00 DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv6 Address. . . . . . . . . . . : fdf1:162d:cbfa:9f2b:1c40:2000:0:20(Prefer red) Lease Obtained. . . . . . . . . . : Monday, February 28, 2011 12:16:33 PM Lease Expires . . . . . . . . . . : Saturday, March 12, 2011 12:16:36 PM Link-local IPv6 Address . . . . . : fe80::b557:f62a:7425:60e4%11(Preferred) IPv4 Address. . . . . . . . . . . : 10.100.10.20(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 10.100.10.1 DHCPv6 IAID . . . . . . . . . . . : 234886493 DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-14-F4-BD-0D-00-15-5D-0A-CB-00 DNS Servers . . . . . . . . . . . : fdf1:162d:cbfa:9f2b:1cd1::10 10.100.10.10 NetBIOS over Tcpip. . . . . . . . : Enabled Connection-specific DNS Suffix Search List : company.local