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From: "Pegasus Mc Cleaft" <ken@mthelicon.com>
To: <freebsd-hackers@freebsd.org>
Date: Thu, 7 May 2009 10:18:55 +0100
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Subject: DAD Detected duplicate ipv6 address - 7.2 Stable
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Hi Hackers,=20

    I was wondering if someone could give me some advice. I just updated =
one of my servers from 7.2-pre to 7.2-stable (07/05/2009) and lost my =
IPv6 connectivity. The machine has been given a static IPv6 address and =
ND is not used (I set the address in the rc.conf file). On reboot, I get =
messages like this in the dmesg:

vr0: DAD detected duplicate IPv6 address 2001:49f0:2023::2: NS =
in/out=3D3/1, NA in=3D0
vr0: DAD complete for 2001:49f0:2023::2 - duplicate found
vr0: manual intervention required
vr0: DAD detected duplicate IPv6 address fe80:1::213:8fff:fe5c:1a5f: NS =
in/out=3D3/1, NA in=3D0
vr0: DAD complete for fe80:1::213:8fff:fe5c:1a5f - duplicate found
vr0: manual intervention required
vr0: possible hardware address duplication detected, disable IPv6
hercules$ ifconfig
vr0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu =
1500
        options=3D2808<VLAN_MTU,WOL_UCAST,WOL_MAGIC>
        ether 00:13:8f:5c:1a:5f
        inet6 fe80::213:8fff:fe5c:1a5f%vr0 prefixlen 64 duplicated =
scopeid 0x1=20
        inet 66.90.118.40 netmask 0xffffff00 broadcast 66.90.118.255
        inet6 2001:49f0:2023::2 prefixlen 64 duplicated=20
        media: Ethernet autoselect (100baseTX <full-duplex>)
        status: active
plip0: flags=3D108810<POINTOPOINT,SIMPLEX,MULTICAST,NEEDSGIANT> metric 0 =
mtu 1500
lo0: flags=3D8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
        inet6 ::1 prefixlen 128=20
        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x3=20
        inet 127.0.0.1 netmask 0xff000000=20

This fault has only shown up since the upgrade and I am at a loss for =
what to try to do to fix this or debug. Any advice would be appreciated. =


Peg