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Unable to ping6 on local network im vmware



Hello,

I've started to use  IPv6 on Debian Lenny. To do so I set up an HE-/64 Tunnel an registered an a routed /48 block

tunnel is: 2001:470:1f14:1460::/64
Routed block is: 2001:470:d600::/48

The tunnel is running fine - and I can Ping ipv6 hosts outside.
he-ipv6   Link encap:IPv6-in-IPv4  
          inet6 addr: fe80::ac10:f801/64 Scope:Link
          inet6 addr: 2001:470:1f14:1460::2/64 Scope:Global
          inet6 addr: fe80::ac12:1/64 Scope:Link
          inet6 addr: fe80::576a:da85/64 Scope:Link
          inet6 addr: fe80::ac10:1/64 Scope:Link
          UP POINTOPOINT RUNNING NOARP  MTU:1280  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:458 (458.0 B)  TX bytes:618 (618.0 B)

Furthermore I assigned a /64slice of 2001:470:d600::/48 to dummy0

dummy0    Link encap:Ethernet  HWaddr e6:70:b6:3e:23:e7  
          inet addr:172.18.0.1  Bcast:172.18.0.255  Mask:255.255.255.0
          inet6 addr: 2001:470:d600::1/64 Scope:Global
          inet6 addr: fe80::e470:b6ff:fe3e:23e7/64 Scope:Link
          UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:126 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:14232 (13.8 KiB)

and set up raddvd to announc auto-configuration
interface dummy0
{
   AdvSendAdvert on;
   prefix 2001:470:d600::1/64
   {
   };
};

routing seems to be running fine and I can reach  2001:470:d600::1 from the outside
ip -6 route
2001:470:1f14:1460::1 dev he-ipv6  metric 1024  mtu 1280 advmss 1220 hoplimit 4294967295
2001:470:1f14:1460::/64 via :: dev he-ipv6  metric 256  mtu 1280 advmss 1220 hoplimit 4294967295
2001:470:d600::/64 dev dummy0  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev vmnet1  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev vmnet8  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev eth0  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev dummy0  metric 256  mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 via :: dev he-ipv6  metric 256  mtu 1280 advmss 1220 hoplimit 4294967295
default via 2001:470:1f14:1460::1 dev he-ipv6  metric 1024  mtu 1280 advmss 1220 hoplimit 4294967295

ping from miredo / toredo client:
ping6 2001:470:d600::1
PING6(56=40+8+8 bytes) 2001::5ef5:79fd:1c04:3ba8:a8b0:4d4c --> 2001:470:d600::1
16 bytes from 2001:470:d600::1, icmp_seq=0 hlim=61 time=125.626 ms
16 bytes from 2001:470:d600::1, icmp_seq=1 hlim=61 time=27.079 ms
16 bytes from 2001:470:d600::1, icmp_seq=2 hlim=61 time=27.759 ms

dummy0 is assigned to a vmware-bridge, that is connected to a debian lenny guest.
The guest got its radvd announce and set up his interfacse:

eth1      Link encap:Ethernet  HWaddr 00:0C:29:BB:D7:70  
          inet addr:172.18.0.2  Bcast:172.18.0.255  Mask:255.255.255.0
          inet6 addr: 2001:470:d600:0:20c:29ff:febb:d770/64 Scope:Global
          inet6 addr: fe80::20c:29ff:febb:d770/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:34 errors:0 dropped:0 overruns:0 frame:0
          TX packets:55 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:6820 (6.6 KiB)  TX bytes:4602 (4.4 KiB)

ip -6 route
2001:470:d600::/64 dev eth1  proto kernel  metric 256  expires 2147074sec mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev eth1  metric 256  expires 21325411sec mtu 1500 advmss 1440 hoplimit 4294967295
fe80::/64 dev eth0  metric 256  expires 21325466sec mtu 1500 advmss 1440 hoplimit 4294967295
default via fe80::e470:b6ff:fe3e:23e7 dev eth1  proto kernel  metric 1024  expires 1717sec mtu 1500 advmss 1440 hoplimit 64

The interface itself is running fine, the guest is able to ping 172.18.0.1 (IPv4 address of host), but he's not able to ping6 2001:470:d600::1.
Even more, the guest seems to be unaware of his neighbor:

ping6 2001:470:d600::1
PING 2001:470:d600::1(2001:470:d600::1) 56 data bytes
From 2001:470:d600:0:20c:29ff:febb:d770 icmp_seq=1 Destination unreachable: Address unreachable

ip -6 neig
fe80::e470:b6ff:fe3e:23e7 dev eth1 lladdr e6:70:b6:3e:23:e7 router STALE
2001:470:d600::1 dev eth1  FAILED

What might be wrong here?
Thanks in advance,
J.Luehr

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