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mjourney
Beginner

Switchport claiming an IP address (DHCP)

Here's a weird situation.

My PC intermittently reports an IP address conflict (drops connection and logs event ID 4199 in the windows system log:

"The system detected an address conflict for IP address 0.0.0.0 with the system having network hardware address 00-08-2F-07-D4-90. Network operations on this system may be disrupted as a result."

 

Here's the strangeness...  That MAC address belongs to the switchport on the switch my PC is connected to:

 

TAC_A1_3850-48_STK#sh int g1/0/16
GigabitEthernet1/0/16 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 0008.2f07.d490 (bia 0008.2f07.d490)
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)

<SNIP>

 

Here's the config:

interface GigabitEthernet1/0/16
switchport access vlan 500
switchport mode access
switchport voice vlan 832
authentication control-direction in
authentication host-mode multi-domain
authentication port-control auto
mab
dot1x pae authenticator
spanning-tree portfast
spanning-tree bpduguard enable
end

 

What could cause this???

Mike J.

1 REPLY 1
mjourney
Beginner

And...  Of course... my next google search (the last of many) found the answer.

https://www.alfredtong.com/cisco/cisco-switch-causes-duplicate-ip-address-conflict-errors-windows-7/

Just turn off IP Address Tracking on the switch.

Hope this helps someone other than me.

Mike J.