ip dhcp conflict

[chpmotry]

hi guys.

I have a network with a 3750 switch and two D-Link hubs.

I have a Windows 10 virtual machine that is supposed to get an IP switch via DHCP. During the IP acquisition phase of the virtual machine, the virtual machine gets an IP but immediately loses its IP. I reviewed the event viewer and came across the following error.

I looked at the switch in the mac address-table and saw that it is connected to another hub. The interesting thing is that the MAC address of this intruder client is not in the switch's ARP table nor in the DHCP binding. I don't know why my virtual machine should show this error due to IP conflict with that intruder client.How do you think the problem can be fixed?

[M02@rt37 · Accepted solution]

Hello @chpmotry 

The intruder PC has got static IP configuration ?

Unplug it, and see if the Vm gers and keeps its IP...

Try to see to remove hubs, there are dumbs!! replace them with small managed swiches.

[chpmotry]

Thank you M02@rt37 

Since this intruder PC is located behind a hub, it's difficult for me to determine its exact location. Even pinging it results in a request timeout.

[pieterh]

MAC-Vendor lookup produced this result:
"The vendor code (first half of the MAC address) 00:17:61 belongs to Sony Corporation"
does this give a hint about what device this may be ? (smart-TV, ip-cam, mobile-phone, Playstation? etc?)

you can also try to rirst to give your PC another fixed ip-address (.21) and try to open http(s)://172.16.5.20? 
and see what response you get
if http(/https is not succesful try telnet/ssh

you can also use a tool (e.g. WnetWatcher) to scan the network and retreive the device's information  

[chpmotry]

Thank you @pieterh 

You made a good point. I’ll definitely look into it.