in some MAKEDEVs, will see to them in a separate commit.

http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt

with this `!' lines in /etc/hostname.* run even without certain lines
(like a comment) preceeding it.

depending on IFS).  This replaces the ed and sed code previously
used to do this.

when no neighboring router is found (rare case).  this is to conform
strictly to the ND spec.  it is safe to leave it empty.

Allows visual editors to be used.

XXX shares database file with IPv4 one (0.0.127.in-addr.arpa)

Submitted by: kevlo@

DAD before the actual rtsol(8) run happens later.  and since it will rtsol,
it is going to be up in any case.

XXX both "dhcp" and "rtsol" has keyword *down* at the end.  is it okay?

sleep for net.inet6.ip6.dad_count seconds to ensure that IPv6 DAD is completed.
TODO: rtsold (rc.conf line), manpage

to do this,
1. in sysctl.conf, add these lines:
net.inet6.ip6.forwarding=0
net.inet6.ip6.accept_rtadv=1
2. in hostname.foo, add
rtsol
specifying two or more interfaces with "rtsol" may result in strange
behavior - ipv6 spec does not permit multi-interface node to be autoconfig'ed.