Trace IP Conflict

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GowthamBalaji

Reputable
Jun 25, 2014
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Dear Friends

In My PC ( Which is connected with other PC's in my firm through Local Ethernet LAN) i have detected continuous IP conflict error for the past few weeks. I have tried to trace the conflicting system by arp -a command and verifying all MAC with the conflicting MAC Address in the my event log. The Conflicting MAC address is not present in the arp table. I want to trace out the person who is repeatedly tinkering with IP address.


Please provide your solutions

 
Solution
pierrerock
when i get IP conflict, it is when a PC with at static IP address gets his IP address taken by a PC with dynamic address. Static address is useful when portforwarding so my main PC uses and my console uses a static Address. If anything like a smartphone of a friend connect in while my computer is shut, there is a chance my PC address will be taken.

You can connect to the router to see which MAC address is actually connected using which IP address.
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bill001g

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Aug 9, 2012
28,325
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Arp table is just a simple ip to mac mapping. You would have to ping every ip and then hope they had a ip assigned If you would get lucky and see the other mac address mapped to the ip it does not tell you much you do not already know. Finding a IP is same amount of work as finding a mac address.

The key is having the mac address. Assuming someone is not being a jerk and changing their mac address just to mess with you it should represent a single machine.

If you have a manged switch it is very simple you just display the mac table and it will tell you which port it learned that mac address on.

When you do not have managed switches it is going to be very hard. What you are going to have to do is pretty much walk around and identify every machine. If you are using a domain controller type of login and it also is your DHCP server you many times get lots of information about the machine so you should be able to tie userid to mac addresses and at least eliminate a bunch of machines as not the problem.
 
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pierrerock

pierrerock

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Jul 4, 2014
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when i get IP conflict, it is when a PC with at static IP address gets his IP address taken by a PC with dynamic address. Static address is useful when portforwarding so my main PC uses and my console uses a static Address. If anything like a smartphone of a friend connect in while my computer is shut, there is a chance my PC address will be taken.

You can connect to the router to see which MAC address is actually connected using which IP address.
 
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