- in in6_ifattach_getifid(), we can grab interface id source iff the source
is universally (worldwide) unique. ARCnet hardware address is of 8bit and
does not satisfy the condition.
(in6_ifattach_getifid() is for getting interface id usable for pseudo
interfaces like gif*)
- xx_to_eui64() should return EUI64 format, not IPv6 interface id format.
this may seem awkward so I wish to clean these things up.
- in nd6.c, change if clause into case clause to allow future addition
of IFT_xxx easier.
itojun