Utlity to find duplicate ip addresses ?

[NewNic]

Is there a Utlity i can run that will find dulicate Ip addresses ?

Thanks

 

[rainman]

If you have access to the router, you can view the ARP table to see the IP and MAC addresses in the ARP table:

show arp

If you see an entry for 2 IP addresses, with different MAC addresses, then you'll find your dup.


-Rainman

 

[jdeisenm]

Disconnect the computer you know and run this command on your windows pc.
nbtstat -a x.x.x.x
=============
C:\>nbtstat -a 10.10.10.188
Node IpAddress: [10.10.10.199] Scope Id: []

NetBIOS Remote Machine Name Table
Name Type Status
---------------------------------------------
PC1131 <00> UNIQUE Registered
MYDOMAIN <00> GROUP Registered
PC1131 <20> UNIQUE Registered
PC1131 <03> UNIQUE Registered
PC1131$ <03> UNIQUE Registered
MYDOMAIN <1E> GROUP Registered
JOEUSER <03> UNIQUE Registered
MAC Address = 00-0D-56-81-0F-C8
===================================================
You may get enough info to find the pc by the logged in user and/or the computer name.

Do you have managed switches? They usually have the ability to tell you which mac address is connected to which port.

On a cisco IOS switch the command is.
show mac-address-table | include 0fc8