I setup IPv6 in my Ubuntu 12.04 on eth0 using command

ifconfig eth0 inet6 add 2001:db8:fedc:cdef::1/64

but when i try to ping eth0 itself using

ping6 2001:db8:fedc:cdef::1

it always gives

PING 2001:db8:fedc:cdef:0:0:0:1(2001:db8:fedc:cdef::1)  56 data bytes

 From ::1 icmp_seq=1 Destination unreachable: Address unreachable

 From ::1 icmp_seq=2 Destination unreachable: Address unreachable

 From ::1 icmp_seq=3 Destination unreachable: Address unreachable

I think that it automatically is pinging from ::1 to `2001:db8:fedc:cdef::1

Command

ip addr show dev eth0

it gives

2: eth0:<NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN qlen 1000

link/ether 00:1b:38:a1:a2:50 brd ff:ff:ff:ff:ff:ff

inet6 2001:db8:fedc:cdef::1/64 scope global tentative 

   valid_lft forever preferred_lft forever

Command

ip -6 route

it gives

2001:db8:fedc:cdef::/64 dev eth0  proto kernel  metric 256 

fe80::/64 dev eth0  proto kernel  metric 256 

Command

ip6tables -L

it gives

Chain INPUT (policy ACCEPT)

target     prot opt source               destination         



Chain FORWARD (policy ACCEPT)

target     prot opt source               destination         



Chain OUTPUT (policy ACCEPT)

target     prot opt source               destination   

Command

ip6tables -F

it gives nothing.

Please help how to solve this.

this may have clue for someone

command

ip -6 route get 2001:db8:fedc:cdef::1

gives

2001:db8:fedc:cdef::1 from :: via 2001:db8:fedc:cdef::1 dev eth0  src ::1  metric 0 

cache 

why it has src ::1 ?