Cannot ping with IPv6

Hi,

I'm running Windows Vista Ultimate with IPv6 and Teredo installed and
enabled, but it seems I

am unable to ping any hosts on the local network (which consists of one
other XP SP3 machine)

or internet. Both computers are connected to a standard router (Dell
TrueMobile 2300, which is

IPv4 only I believe). Still, an IPv4 router should not matter considering
Teredo should be

enabled on both computers.

Running ipconfig returns the following:

Vista
----------------------------------------------------------------

Ethernet adapter Loopback:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::504b:717d:6870:54b6%12
Autoconfiguration IPv4 Address. . : 169.254.84.182
Subnet Mask . . . . . . . . . . . : 255.255.0.0
Default Gateway . . . . . . . . . :

Ethernet adapter Local Area Connection:

Connection-specific DNS Suffix . :
IPv6 Address. . . . . . . . . . . : 2001:0:d5c7:a2ca:0:f2f6:adfd:5d0
IPv6 Address. . . . . . . . . . . : 2001:0:d5c7:a2ca:0:f2f6:adfd:5d0e
Link-local IPv6 Address . . . . . : fe80::5efe:169.254.84.182%9
Link-local IPv6 Address . . . . . : fe80::5efe:192.168.2.4%9
Link-local IPv6 Address . . . . . : fe80::5efe:192.168.2.6%9
Link-local IPv6 Address . . . . . : fe80::ffff:ffff:fffd%9
Link-local IPv6 Address . . . . . : fe80::504b:717d:6870:54b6%9
Link-local IPv6 Address . . . . . : fe80::80da:92d4:339a:6712%9
IPv4 Address. . . . . . . . . . . : 192.168.2.6
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.2.1

Tunnel adapter Local Area Connection* 6:

Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :

Tunnel adapter Local Area Connection* 9:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::5efe:192.168.2.6%11
Default Gateway . . . . . . . . . :

Tunnel adapter Local Area Connection* 11:

Connection-specific DNS Suffix . :
Link-local IPv6 Address . . . . . : fe80::5efe:169.254.84.182%14
Default Gateway . . . . . . . . . :
----------------------------------------------------------------

XP SP3
----------------------------------------------------------------
Ethernet adapter Wireless Network Connection:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : 192.168.2.4
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.2.1

Tunnel adapter Teredo Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : fe80::ffff:ffff:fffd%4
Default Gateway . . . . . . . . . :

Tunnel adapter Automatic Tunneling Pseudo-Interface:

Connection-specific DNS Suffix . :
IP Address. . . . . . . . . . . . : fe80::5efe:192.168.2.4%2
Default Gateway . . . . . . . . . :
----------------------------------------------------------------

Here is what some of the ping commands returned. (I do not have much of an
understanding of

IPv6, so I may be giving a bad address to ping some of the time.)

Vista pinging XP
----------------------------------------------------------------
PS C:\Users\Alex> ping fe80::ffff:ffff:fffd%4

Pinging fe80::ffff:ffff:fffd%4 with 32 bytes of data:

PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.

Ping statistics for fe80::ffff:ffff:fffd%4:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
----------------------------------------------------------------
PS C:\Users\Alex> ping fe80::ffff:ffff:fffd

Pinging fe80::ffff:ffff:fffd from fe80::ffff:ffff:fffd%9 with 32 bytes of
data:

Reply from fe80::ffff:ffff:fffd: time<1ms
Reply from fe80::ffff:ffff:fffd: time<1ms
Reply from fe80::ffff:ffff:fffd: time<1ms
Reply from fe80::ffff:ffff:fffd: time<1ms

Ping statistics for fe80::ffff:ffff:fffd:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
----------------------------------------------------------------
PS C:\Users\Alex> ping fe80::5efe:192.168.2.4%2

Pinging fe80::5efe:192.168.2.4%2 with 32 bytes of data:

PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.
PING: transmit failed, error code 1231.

Ping statistics for fe80::5efe:192.168.2.4%2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
----------------------------------------------------------------
PS C:\Users\Alex> ping fe80::5efe:192.168.2.4

Pinging fe80::5efe:192.168.2.4 from fe80::5efe:192.168.2.4%9 with 32 bytes
of data:

Reply from fe80::5efe:192.168.2.4: time<1ms
Reply from fe80::5efe:192.168.2.4: time<1ms
Reply from fe80::5efe:192.168.2.4: time<1ms
Reply from fe80::5efe:192.168.2.4: time<1ms

Ping statistics for fe80::5efe:192.168.2.4:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
----------------------------------------------------------------


XP pinging Vista
----------------------------------------------------------------
PS C:\Documents and Settings\Alex> ping 2001:0:d5c7:a2ca:0:f2f6:adfd:5d0

Pinging 2001:0:d5c7:a2ca:0:f2f6:adfd:5d0 with 32 bytes of data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 2001:0:d5c7:a2ca:0:f2f6:adfd:5d0:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
----------------------------------------------------------------
(same for 2001:0:d5c7:a2ca:0:f2f6:adfd:5d0e)
----------------------------------------------------------------
PS C:\Documents and Settings\Alex> ping fe80::5efe:169.254.84.182%9

Pinging fe80::5efe:169.254.84.182%9 with 32 bytes of data:

IP parameter problem.
IP parameter problem.
IP parameter problem.
IP parameter problem.

Ping statistics for fe80::5efe:169.254.84.182%9:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
----------------------------------------------------------------
PS C:\Documents and Settings\Alex> ping fe80::5efe:169.254.84.182

Pinging fe80::5efe:169.254.84.182 with 32 bytes of data:

Destination net unreachable.
Destination net unreachable.
Destination net unreachable.
Destination net unreachable.

Ping statistics for fe80::5efe:169.254.84.182:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
----------------------------------------------------------------

Pings to all other addresses with/without zone IDs have similar results.

A ping to any of the sites listed on http://www.ipv6.org/v6-www.html from
Vista returns:

Ping request could not find host www.6bone.net. Please check the name and
try again.

And on XP something like:

----------------------------------------------------------------
Pinging www.kame.net [2001:200:0:8002:203:47ff:fea5:3085] with 32 bytes of
data:

Request timed out.
Request timed out.
Request timed out.
Request timed out.

Ping statistics for 2001:200:0:8002:203:47ff:fea5:3085:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
----------------------------------------------------------------

No surprise, I also can't view any of the sites from IE7/Firefox.
I'll be glad to provide any other info that is needed to diagnose the problem.

Thanks.