IPv6: "xxx::x already configured" in logs... why?

[Hiroki Sato]

Larry Rosenman <ler at lerctr.org> wrote
  in <20140612202349.GA65079 at thebighonker.lerctr.org>:

le> I just started using IPv6 behind my (new to me) Cisco 1841.
le>
le> I see lots of:
le> Jun 12 15:16:25 thebighonker kernel: in6_ifadd: 2001:470:1f0f:3ad:223:7dff:fe9e:6e8a is already configured
le>
le> in my /var/log/messages.
le>
le> The rc.conf:
le>
le> cloned_interfaces="lagg0:sticky "
le> create_args_lagg0="laggport bce0 laggport bce1 laggproto loadbalance"
le> ifconfig_lagg0="192.147.25.65/24"
le> ifconfig_bce0="up"
le> ifconfig_bce1="up"
le> defaultrouter="192.147.25.1"
le> ####################################################
le> #        IPv6 AutoConf:
le> ifconfig_lagg0_ipv6="inet6 accept_rtadv"
le> rtsold_enable="YES"
le> ####################################################
le> hostname=thebighonker.lerctr.org
le> ifconfig_lagg0_alias0="inet 192.147.25.45/24"
le> ifconfig_lagg0_alias1="inet 192.147.25.11/24"
le> ifconfig_lagg0_alias2="inet 192.147.25.66/24"
le> sshd_enable="YES"
le> ntpd_enable="YES"
le> powerd_enable="YES"
le> # Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
le> dumpdev="AUTO"
le> zfs_enable="YES"
le> # ------------
le>
le>
le> hostid_enable="YES"
le>
le> postgresql_enable="YES"
le> fah_enable="NO"
le> fah2_enable="NO"
le> linux_enable="YES"
le> smartd_enable="YES"
le> spamd_enable="YES"
le> devcpu_enable="YES"
le> clamav_clamd_enable="YES"
le> clamav_freshclam_enable="YES"
le> sendmail_enable="NONE"
le> exim_enable="YES"
le> exim_flags="-bd -q5m"
le> named_enable="YES"
le> named_program="/usr/local/sbin/named"
le> bsdstats_enable="YES"
le> spamd_flags="-c -Q -m 20"
le> apache22_enable="YES"
le> syslogd_flags="-n -a 192.147.25.0/24:* -a 209.198.148.248/29:*"
le> bacula_fd_enable="YES"
le> sshblock_enable="YES"
le> dovecot_enable="YES"
le> monthly_stats_enable="YES"
le> boinc_client_enable="YES"
le> microcode_update_enable="YES"
le> ----
le> sysctl.conf:
le>
le> # $FreeBSD: stable/10/etc/sysctl.conf 112200 2003-03-13 18:43:50Z mux $
le> #
le> #  This file is read when going to multi-user and its contents piped thru
le> #  ``sysctl'' to adjust kernel values.  ``man 5 sysctl.conf'' for details.
le> #
le>
le> # Uncomment this to prevent users from seeing information about processes that
le> # are being run under another UID.
le> #security.bsd.see_other_uids=0
le> vm.lowmem_period=0
le> vfs.usermount=1
le> vfs.zfs.super_owner=1
le> kern.elf32.fallback_brand=3
le> kern.ipc.shm_allow_removed=1
le> net.inet6.ip6.dad_count=0
le>
le> =====
le>
le> Ideas? (I may be an idiot, so any criticism welcomed).
le>
le> if you need the 1841's config, I can supply that as well.  It's using a Hurricane
le> electric Tunnel.

 How frequent were the log message added into /var/log/messages?  And
 when did it start to happen after boot.  Just after lagg0 is
 configured?

-- Hiroki
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