Your ip version six has been disabled in the system you are using.
To enabled it again, find those entries in the file /etc/sysctl.conf and change the 1 to a 0. Then, issue the command sysctl -p
After that try ping6 ::1
Please help me with the inability to use ping6
root@server1:/home/server1# ifconfig
eth0 Link encap:Ethernet HWaddr 00:23:ae:27:b9:ec
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0... (1 Reply)