Problem
Sometimes when I restart one of my Windows 10 computers the network never gets online. I have to disable/enable the network to get it back. the reason seems to be an IP conflict with the address 0.0.0.0. This computer has a fixed IP, no DHCP is involved. The NIC is an Intel I219-V.
Analysis
Event ID 4199, TCPIP: The system detected an address conflict for IP address 0.0.0.0 with the system having network hardware address 20-4C-9E-49-38-8A.
A quick check in the tracking system revealed this article from Cisco: http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/8021x/116529-problemsolution-product-00.html. It talks about a conflict between the IP conflict detection system in Windows and an ARP Probe sent by the switch as part of IP Device Tracking. I am no Cisco expert, but I would like to have a chat with whoever thought that IP conflict detection should start BEFORE the nic has an IP set…
As far as I can tell the IP Tracking function on the switch is enabled by default from IOS version 15.2.
Workaround
Turn off IP Device Tracking at the switch
https://supportforums.cisco.com/discussion/11960461/ip-device-tracking talks about running the following commands on the switch:
switch(config)# int range gig1/0/1 – 24
switch(config-if)# nmsp attach suppress
end
This is supposed to turn off the IP Device tracking on a per switch basis. I do not have access to my switching infrastructure, so I have not tested this. Update 2018-05-15: I can confirm that this workaround solves the problem.
Turn off the Gratuitous ARP Function
Refer to this ancient KB: https://support.microsoft.com/en-us/kb/219374. It is written for NT4, but it still works. Be aware, this basically turns off IP Conflict detection completely.
Upgrade your NIC driver
And hope that it helps…
