accept_ra_defrtr - BOOLEAN
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      Functional default: enabled if accept_ra is enabled.
                          disabled if accept_ra is disabled.

Does it mean accept_ra_defrtr is enabled if accept_ra is enabled? Doesn't look like it:

$ echo 1 >/proc/sys/net/ipv6/conf/eth0/accept_ra
$ cat /proc/sys/net/ipv6/conf/eth0/accept_ra_defrtr

Or is the new value just used internally and cannot be read (like writing to ipv6/conf/all/**)?

What does functional default mean?

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