I have centos 6 running kvm. IPv4 works perfectly works. But I am having some problem with ipv6, looks like its bridge routing problem but stuck.

here are my bridge detail:

bridge name bridge id STP enabled interfaces

br0 8000.000af75613f2 no eth1

vnet1

br4 8000.000af75613f0 no eth0

ip -6 route shows :

unreachable ::/96 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable ::ffff:0.0.0.0/96 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable 2002:a00::/24 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable 2002:7f00::/24 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable 2002:a9fe::/32 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable 2002:ac10::/28 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable 2002:c0a8::/32 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

unreachable 2002:e000::/19 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

2a00:c88:4000:1431::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

2a00:c88:4000:1650::/64 dev br4 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

unreachable 3ffe:ffff::/32 dev lo metric 1024 error -101 mtu 65536 advmss 65476 hoplimit 4294967295

fe80::/64 dev vnet0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev vnet1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev vnet2 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev vnet3 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev eth0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev eth1 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev br0 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

fe80::/64 dev br4 proto kernel metric 256 mtu 1500 advmss 1440 hoplimit 4294967295

default via 2a11:c99:4111:110::11:211 dev br4 metric 1 mtu 1500 advmss 1440 hoplimit 4294967295

Then I added, /etc/sysconfig/network-script/ifcfg-br4

DEVICE=br4

TYPE=Bridge

ONBOOT=yes

BOOTPROTO=static

IPADDR=ipv4address here

NETMASK=255.255.255.0

DNS1=mydnsserver.org

DELAY=0

NM_CONTROLLED=no

IPV6INIT=yes

IPV6_AUTOCONF=no

#IPV6_DEFROUTE="yes"

IPV6_FAILURE_FATAL=yes

IPV6ADDR=2a11:c99:4111:110::11:65/64

IPV6_DEFAULTGW= 2a11:c99:4111:110::11:211

I can ping the gateway from the kvm host but I cannot ping6 out from the kvm guest, also I cannot ping kvm guest from external host that is in ipv6 network.

I appreciate some guidance on this.