Hi Michael,
Is 50-67-AE-17-DB-18 the MAC of the PacketFence VM?
Everything I have read yet seems to indicate this is caused by the ip device
tracking on the switch as you said.
You may have to capture some DHCP and ARP traffic from the windows device (e.g.
with wireshark) to be able to see where those packets come from, and in which
order.
This problem seems to stem from ARP queries.
None of the PacketFence services should be making ARP queries per se, so that
makes me suspicious of this coincidence.
If in doubt, try shutting down services listening on the management interface
of the PacketFence ZEN until you hit the right one.
And try to capture traffic from both ends (PacketFence and the windows client).
I wish I could tell you more, but it’s a case of “insufficient data” at this
point.
I’d say tcpdump and wireshark are your best friends for such a case.
Regards,
--
Louis Munro
[email protected] :: www.inverse.ca
+1.514.447.4918 x125 :: +1 (866) 353-6153 x125
Inverse inc. :: Leaders behind SOGo (www.sogo.nu) and PacketFence
(www.packetfence.org)
> On Feb 19, 2016, at 10:05 , Michael R. Haag
> <[email protected]> wrote:
>
> After setting up Packetfence (with help from Inverse), we’re seeing Duplicate
> IP Address messages on Windows hosts on our network (Mostly Windows 7, some
> Windows 10).
>
> Microsoft and Cisco both indicate perhaps this message is caused by the “ip
> device tracking” feature of Cisco switches (we’re using 2960X).
>
> I first set up a “probe delay” on the feature, but that did not resolve the
> issue so I completely disabled ip device tracking on the switches.
>
> Hosts on the switches are still receiving the error, but only when our
> Packetfence ZEN appliance is up. If I power it off, no one gets the
> duplicate. The address reported as duplicate is always “0.0.0.0”.
>
>
> From windows event log:
>
> “Description:
> The system detected an address conflict for IP address 0.0.0.0 with the
> system having network hardware address 50-67-AE-17-DB-18. Network operations
> on this system may be disrupted as a result.”
>
>
>
> Which feature of Packetfence could be causing this problem? (I am not running
> dhcpd on Packetfence)
>
>
> Thank you,
>
> Michael R. Haag
> Computer Services Technician
> Department of Information Technology
> Madison County, NY
> (315) 366-2204
>
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