RHEL: Cannot ping out with IPV6

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Issue

IPv6 pings fail

# ping6 2021::207
PING 2021::207(2021::207) 56 data bytes
^C
--- 2021::207 ping statistics ---
5 packets transmitted, 0 received, 100% packet loss, time 4728ms

Environment

Red Hat Enterprise Linux 6
ip6tables

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