svn commit: r245525 - head/etc/rc.d

[Hiroki Sato]

"Bjoern A. Zeeb" <bz at FreeBSD.org> wrote
  in <201301170127.r0H1Re6Y038117 at svn.freebsd.org>:

bz> Author: bz
bz> Date: Thu Jan 17 01:27:39 2013
bz> New Revision: 245525
bz> URL: http://svnweb.freebsd.org/changeset/base/245525
bz>
bz> Log:
bz>   Add a conditional sleep 1 in case we add any IPv6 addresses to interfaces.
bz>   Do this per jail started, not per address.  This will allow DAD to complete
bz>   and services to properly start.   Before we have seen problems with services
bz>   trying to start before the IPv6 address was available to use and thus
bz>   erroring and failing to start.
bz>
bz>   MFC after:	3 days

 This may be too pedantic, but I think this delay should use
 DupAddrDetectTransmits (net.inet6.ip6.dad_count).  The default value
 of RETRANS_TIMER and MAX_RTR_SOLICITATION_DELAY in RFC 4861 is 1 sec,
 so the theoretical delay value is (DupAddrDetectTransmits *
 RETRANS_TIMER + MAX_RTR_SOLICITATION_DELAY).  The rc.d/netif script
 uses this value (typically 2 seconds) for DAD.

 I understand a simple 1 second delay works in practice, though.

-- Hiroki
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