also sprach Andrew Shadura <bugzi...@tut.by> [2013.04.23.1256 +0200]: > The question is how to detect this properly. Does `ip monitor` give > any information about that?
Yes, as far as I can tell, ip monitor does only issue an event when
DAD completes.
If I run
ip -6 a a 2001:a60:f10a:0:22cf:30ff:fe2a:7c07/64 dev lan
I see immediately from ip monitor the route it adds:
2001:a60:f10a::/64 dev lan proto kernel metric 256
but it takes 2 seconds for the following to be printed:
4: lan inet6 2001:a60:f10a:0:22cf:30ff:fe2a:7c07/64 scope global
valid_lft forever preferred_lft forever
local 2001:a60:f10a:0:22cf:30ff:fe2a:7c07 via :: dev lo table local proto
none metric 0
checking with `watch -n 0.1`, I can confirm that this coincides with
the removal of the 'tentative' flag.
So all you need is a read loop on ip monitor's output like so:
ip monitor address | while read n iface proto address rest; do
[ $iface = $IFACE ] && [ ${address%/*} = $IF_ADDRESS ] && break;
done
This works in a hook (up at the end of the stanza), but it's ugly
(it causes ip-monitor to be killed with SIGPIPE).
--
.''`. martin f. krafft <madduck@d.o> Related projects:
: :' : proud Debian developer http://debiansystem.info
`. `'` http://people.debian.org/~madduck http://vcs-pkg.org
`- Debian - when you have better things to do than fixing systems
"never attribute to malice what can be
adequately explained by incompetence."
-- mark twain
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