Hello,
 I have a dom0 with 2 interfaces(eth0 connected to WAN, and eth1 
 connected to LAN), I''ve got xen configured with network-bridge on eth1
 and for some reason, I had to add eth1 to virbr0 manualy with brctrl, 
 and on that dom0 I have a tun6to4 interface for 6-to-4, which works 
 perfectly on dom0 and using route I''m passing a /64 over to the domU, 
 which works as long as I keep pinging domU from dom0 over ipv6. As soon 
 as I stop pinging the ipv6 connectivity on domU is lost. Configurations 
 below:
 xend-config.sxp:
 (network-script ''network-bridge netdev=eth1'')
 (vif-script vif-bridge)
 modified scripts/vif-bridge:
 ...
 case "$command" in
     online)
         setup_bridge_port "$vif"
         add_to_bridge "$bridge" "$vif"
         if [ "$vif_ip" = ''172.16.0.2'' ]; then
                 ifconfig virbr0 add 2002:5d67:8294:5272::1/128
                 ip -6 route add 2002:5d67:8294:5272::/64 dev virbr0
         fi
         ;;
 ...
 ifconfig dom0:
 eth0      Link encap:Ethernet  HWaddr 00:0C:6E:42:D8:25
           inet addr:93.103.130.148  Bcast:93.103.255.255  
 Mask:255.255.0.0
           inet6 addr: fe80::20c:6eff:fe42:d825/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:32493502 errors:0 dropped:5252 overruns:0 frame:0
           TX packets:19743882 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:3858497404 (3.5 GiB)  TX bytes:489259627 (466.5 MiB)
           Interrupt:19 Base address:0x2000
 eth1      Link encap:Ethernet  HWaddr 00:11:6B:94:3B:39
           inet addr:172.16.64.1  Bcast:172.16.127.255  
 Mask:255.255.192.0
           inet6 addr: fe80::211:6bff:fe94:3b39/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:1446082 errors:0 dropped:0 overruns:0 frame:0
           TX packets:1511689 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:893284344 (851.9 MiB)  TX bytes:1520468362 (1.4 GiB)
 lo        Link encap:Local Loopback
           inet addr:127.0.0.1  Mask:255.0.0.0
           inet6 addr: ::1/128 Scope:Host
           UP LOOPBACK RUNNING  MTU:16436  Metric:1
           RX packets:22472 errors:0 dropped:0 overruns:0 frame:0
           TX packets:22472 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:3064194 (2.9 MiB)  TX bytes:3064194 (2.9 MiB)
 peth1     Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
           UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
           RX packets:18770651 errors:0 dropped:0 overruns:0 frame:0
           TX packets:30483389 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:4138058579 (3.8 GiB)  TX bytes:1359972829 (1.2 GiB)
           Interrupt:17 Base address:0xc000
 tun6to4   Link encap:IPv6-in-IPv4
           inet6 addr: 2002:5d67:8294::1/16 Scope:Global
           inet6 addr: ::93.103.130.148/128 Scope:Compat
           UP RUNNING NOARP  MTU:1480  Metric:1
           RX packets:95299 errors:0 dropped:0 overruns:0 frame:0
           TX packets:94555 errors:312 dropped:0 overruns:0 carrier:312
           collisions:0 txqueuelen:0
           RX bytes:20810368 (19.8 MiB)  TX bytes:9190625 (8.7 MiB)
 vif0.0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
           UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
           RX packets:1819688 errors:0 dropped:0 overruns:0 frame:0
           TX packets:1637468 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:1948516171 (1.8 GiB)  TX bytes:912858301 (870.5 MiB)
 vif20.0   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
           UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
           RX packets:178357 errors:0 dropped:0 overruns:0 frame:0
           TX packets:452643 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:500
           RX bytes:79072270 (75.4 MiB)  TX bytes:264012337 (251.7 MiB)
 vif20.1   Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
           inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
           UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
           RX packets:0 errors:0 dropped:0 overruns:0 frame:0
           TX packets:34 errors:0 dropped:234863 overruns:0 carrier:0
           collisions:0 txqueuelen:500
           RX bytes:0 (0.0 b)  TX bytes:3878 (3.7 KiB)
 virbr0    Link encap:Ethernet  HWaddr 00:11:6B:94:3B:39
           inet addr:172.16.0.1  Bcast:172.16.63.255  Mask:255.255.192.0
           inet6 addr: 2002:5d67:8294:5272::1/64 Scope:Global
           inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:1701219 errors:0 dropped:0 overruns:0 frame:0
           TX packets:1823178 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:955644061 (911.3 MiB)  TX bytes:1969517278 (1.8 GiB)
 xenbr0    Link encap:Ethernet  HWaddr FE:FF:FF:FF:FF:FF
           UP BROADCAST RUNNING NOARP  MTU:1500  Metric:1
           RX packets:176551 errors:0 dropped:0 overruns:0 frame:0
           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:0
           RX bytes:34750417 (33.1 MiB)  TX bytes:0 (0.0 b)
 ifconfig domU:
 eth0      Link encap:Ethernet  HWaddr 00:16:3E:36:DF:9C
           inet addr:172.16.0.2  Bcast:172.16.63.255  Mask:255.255.192.0
           inet6 addr: 2002:5d67:8294:5272::11/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::10/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::2/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::3/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::4/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::5/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::5743/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::6/64 Scope:Global
           inet6 addr: 2002:5d67:8294:5272::7/64 Scope:Global
           inet6 addr: fe80::216:3eff:fe36:df9c/64 Scope:Link
           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
           RX packets:453040 errors:0 dropped:0 overruns:0 frame:0
           TX packets:178560 errors:0 dropped:0 overruns:0 carrier:0
           collisions:0 txqueuelen:1000
           RX bytes:257725962 (245.7 MiB)  TX bytes:81602770 (77.8 MiB)
           Interrupt:9
 Routing table domU when ping is not running from dom0:
 Kernel IPv6 routing table
 Destination                                 Next Hop                    
            Flags Metric Ref    Use Iface
 2002:5d67:8294:5272::/64                    ::                          
            U     256    2        0 eth0
 fe80::/64                                   ::                          
            U     256    0        0 eth0
 ::/0                                        2002:5d67:8294:5272::1      
            UG    1      3806       1 eth0
 ::1/128                                     ::                          
            U     0      202       1 lo
 2002:5d67:8294:5272::/128                   ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::2/128                  ::                          
            U     0      24576       1 lo
 2002:5d67:8294:5272::3/128                  ::                          
            U     0      245       1 lo
 2002:5d67:8294:5272::4/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::5/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::6/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::7/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::10/128                 ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::11/128                 ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::5743/128               ::                          
            U     0      0        1 lo
 fe80::/128                                  ::                          
            U     0      0        1 lo
 fe80::216:3eff:fe36:df9c/128                ::                          
            U     0      1168       1 lo
 ff02::1:ff00:0/128                          ff02::1:ff00:0              
            UC    0      66       0 eth0
 ff02::1:ff36:df9c/128                       ff02::1:ff36:df9c           
            UC    0      59       0 eth0
 ff00::/8                                    ::                          
            U     256    0        0 eth0
 Routing table dom0 when ping to domU is not running:
 Kernel IPv6 routing table
 Destination                                 Next Hop                    
            Flags Metric Ref    Use Iface
 ::/96                                       ::                          
            U     256    1        0 tun6to4
 2002:5d67:8294:5272::2/128                  2002:5d67:8294:5272::2      
            UC    0      38       1 virbr0
 2002:5d67:8294:5272::/64                    ::                          
            U     256    0        0 virbr0
 2002:5d67:8294:5272::/64                    ::                          
            U     1024   0        0 virbr0
 2002::/16                                   ::                          
            U     256    0        0 tun6to4
 2000::/3                                    ::192.88.99.1               
            UG    1      2242       0 tun6to4
 fe80::200:ff:fe00:0/128                     fe80::200:ff:fe00:0         
            UC    0      152       3 virbr0
 fe80::216:3eff:fe36:df9c/128                fe80::216:3eff:fe36:df9c    
            UC    0      191       3 virbr0
 fe80::/64                                   ::                          
            U     256    0        0 virbr0
 fe80::/64                                   ::                          
            U     256    0        0 vif0.0
 fe80::/64                                   ::                          
            U     256    0        0 peth1
 fe80::/64                                   ::                          
            U     256    0        0 vif20.0
 fe80::/64                                   ::                          
            U     256    0        0 vif20.1
 fe80::/64                                   ::                          
            U     256    0        0 eth0
 fe80::/64                                   ::                          
            U     256    0        0 eth1
 fe80::/64                                   ::                          
            U     256    0        0 tun6to4
 ::1/128                                     ::                          
            U     0      3        1 lo
 ::93.103.130.148/128                        ::                          
            U     0      0        1 lo
 2002::/128                                  ::                          
            U     0      0        2 lo
 2002:5d67:8294::1/128                       ::                          
            U     0      58       1 lo
 2002:5d67:8294:5272::/128                   ::                          
            U     0      0        2 lo
 2002:5d67:8294:5272::1/128                  ::                          
            U     0      2559       1 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::20c:6eff:fe42:d825/128                ::                          
            U     0      0        1 lo
 fe80::211:6bff:fe94:3b39/128                ::                          
            U     0      0        1 lo
 ff00::/8                                    ::                          
            U     256    0        0 virbr0
 ff00::/8                                    ::                          
            U     256    0        0 vif0.0
 ff00::/8                                    ::                          
            U     256    0        0 peth1
 ff00::/8                                    ::                          
            U     256    0        0 vif20.0
 ff00::/8                                    ::                          
            U     256    0        0 vif20.1
 ff00::/8                                    ::                          
            U     256    0        0 eth0
 ff00::/8                                    ::                          
            U     256    0        0 eth1
 ff00::/8                                    ::                          
            U     256    0        0 tun6to4
 Routing table domU when ping is runnign from dom0:
 Kernel IPv6 routing table
 Destination                                 Next Hop                    
            Flags Metric Ref    Use Iface
 2002:5d67:8294:5272::1/128                  2002:5d67:8294:5272::1      
            UC    0      7        0 eth0
 2002:5d67:8294:5272::/64                    ::                          
            U     256    2        0 eth0
 fe80::/64                                   ::                          
            U     256    0        0 eth0
 ::/0                                        2002:5d67:8294:5272::1      
            UG    1      3806       1 eth0
 ::1/128                                     ::                          
            U     0      202       1 lo
 2002:5d67:8294:5272::/128                   ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::2/128                  ::                          
            U     0      24590       1 lo
 2002:5d67:8294:5272::3/128                  ::                          
            U     0      245       1 lo
 2002:5d67:8294:5272::4/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::5/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::6/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::7/128                  ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::10/128                 ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::11/128                 ::                          
            U     0      0        1 lo
 2002:5d67:8294:5272::5743/128               ::                          
            U     0      0        1 lo
 fe80::/128                                  ::                          
            U     0      0        1 lo
 fe80::216:3eff:fe36:df9c/128                ::                          
            U     0      1168       1 lo
 ff02::1:ff00:0/128                          ff02::1:ff00:0              
            UC    0      120       0 eth0
 ff02::1:ff00:2/128                          ff02::1:ff00:2              
            UC    0      45       0 eth0
 ff02::1:ff36:df9c/128                       ff02::1:ff36:df9c           
            UC    0      98       0 eth0
 ff00::/8                                    ::                          
            U     256    0        0 eth0
 Routing table dom0 when ping is running to domU:
 Kernel IPv6 routing table
 Destination                                 Next Hop                    
            Flags Metric Ref    Use Iface
 ::/96                                       ::                          
            U     256    1        0 tun6to4
 2002:5d67:8294:5272::2/128                  2002:5d67:8294:5272::2      
            UC    0      140       0 virbr0
 2002:5d67:8294:5272::/64                    ::                          
            U     256    0        0 virbr0
 2002:5d67:8294:5272::/64                    ::                          
            U     1024   0        0 virbr0
 2002::/16                                   ::                          
            U     256    0        0 tun6to4
 2000::/3                                    ::192.88.99.1               
            UG    1      2251       0 tun6to4
 fe80::200:ff:fe00:0/128                     fe80::200:ff:fe00:0         
            UC    0      313       0 virbr0
 fe80::216:3eff:fe36:df9c/128                fe80::216:3eff:fe36:df9c    
            UC    0      304       0 virbr0
 fe80::/64                                   ::                          
            U     256    0        0 virbr0
 fe80::/64                                   ::                          
            U     256    0        0 vif0.0
 fe80::/64                                   ::                          
            U     256    0        0 peth1
 fe80::/64                                   ::                          
            U     256    0        0 vif20.0
 fe80::/64                                   ::                          
            U     256    0        0 vif20.1
 fe80::/64                                   ::                          
            U     256    0        0 eth0
 fe80::/64                                   ::                          
            U     256    0        0 eth1
 fe80::/64                                   ::                          
            U     256    0        0 tun6to4
 ::1/128                                     ::                          
            U     0      3        1 lo
 ::93.103.130.148/128                        ::                          
            U     0      0        1 lo
 2002::/128                                  ::                          
            U     0      0        2 lo
 2002:5d67:8294::1/128                       ::                          
            U     0      58       1 lo
 2002:5d67:8294:5272::/128                   ::                          
            U     0      0        2 lo
 2002:5d67:8294:5272::1/128                  ::                          
            U     0      2624       1 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::/128                                  ::                          
            U     0      0        2 lo
 fe80::20c:6eff:fe42:d825/128                ::                          
            U     0      0        1 lo
 fe80::211:6bff:fe94:3b39/128                ::                          
            U     0      0        1 lo
 ff00::/8                                    ::                          
            U     256    0        0 virbr0
 ff00::/8                                    ::                          
            U     256    0        0 vif0.0
 ff00::/8                                    ::                          
            U     256    0        0 peth1
 ff00::/8                                    ::                          
            U     256    0        0 vif20.0
 ff00::/8                                    ::                          
            U     256    0        0 vif20.1
 ff00::/8                                    ::                          
            U     256    0        0 eth0
 ff00::/8                                    ::                          
            U     256    0        0 eth1
 ff00::/8                                    ::                          
            U     256    0        0 tun6to4
 I don''t know where to go or look further, so any help will be 
 appreciated.
 Regards,
 Thomas
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