ifconfig command produces error
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When I tried to assign ipv6 address to my interface, it produces an error as 'bad address 'inet6'"

    #ifconfig eth0 inet6 add fe80::20a:9bff:fe04:33c
    ifconfig: bad address 'inet6'

But my kernel is build with ipv6. And my interface eth0 is already assigned with an ipv6 address.

Thank you.