Re: ifconfig not waiting for DAD completion

[Anthony Mallet <tho%netbsd.org@localhost>]

On Sunday 20 Dec 2015, at 17:17, Roy Marples wrote:
| Here's a patch which adds the -W flag to ifconfig(8) which will wait
| for N seconds for the detached flag to clear.  This does not extend
| the -w flag option duration.
|
| The default has been set to -w 10 -W 2.  Please test it, as we may
| need to increase them - they are currently low to ensure as fast as
| a boot as possible.

Your patch does the job nicely! Thanks!
There is a typo in the etc/default/rc.conf comment, see attachment.

With my Intel i82541PI 1000BASE-T Ethernet (rev. 0x05), the
required -W time is closer to 4-5 secs. I set it to 10 in rc.conf
without bothering too much finding the smallest number, as this
machine is supposed to be on the network anyway and has a single
interface.

The time required for DAD however is much shorter, about 1 second.

What about the sysctl net.inet{,6}.ip{,6}.dad_count. Is it still
useful for anything?

--- rc.conf~	2015-12-30 18:39:27.000000000 +0100
+++ rc.conf	2015-12-30 18:39:50.000000000 +0100
@@ -164,7 +164,7 @@
 #
 ifconfig_wait_dad_flags="-w 10 -W 2"		# wait upto 10 secs for
 						# tentative flag to clear
-						# and upto 3 seconds for the
+						# and up to 2 seconds for the
 						# detached flag to clear
 						# from all addresses
 mdnsd=NO