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In order to activate basic IPv6 functionalities, you first have to enable it (disabled by default).
mattieu@IRIS: ~ $ sudo systune ip6_enable 1 ip6_enable = 0 (0x0) Do you really want to change ip6_enable to 1 (0x1)? (y/n) y In order for the change in parameter ip6_enable to become effective, reboot the system
Then you have to reboot the system as it was asked.