IP Conflict Vitual Windows 2008

We are having an issue with a Windows 2008 Server after the machine rebooted it is a Virtual Machine within our ESX4.0 enviroment.

Everytime I assign it a specific IP address which it needs because it is a Exchange Voice Mail Server it comes up with a IP Conflict.  I can assign it any other address and it is fine but with this ip it is not.

Help!!! don't know where i am meant to be looking for it.

Thanks
balwynhighAsked:
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Erik BjersPrincipal Systems AdministratorCommented:
Check your network for devices that have the static IP you are trying to use.

Ping the IP then run ARP /a and this should return a list of IP to MAC address including the one you just pinged

You can then google mac identification and check that MAC address to find out what equipment it is on, then it is just down to checking systems.  However if you have a managed switch you may be able to look into the switches ARP table and find out what port the MAC address is on.

And please make sure the static IP you are trying to use is either outside your DHCP scope or excluded.

eb
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balwynhighAuthor Commented:
The address is not pingable at all.  It is like the ip is in the arp cache and is coming through from the ARP Cache of the trunk links for the ESX Servers.

The MAC Address is not coming from any server I can see.

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Erik BjersPrincipal Systems AdministratorCommented:
I hate to say it but I still think something on your network has that IP and you are just going to have to do the leg work and find it.  Do you see a MAC associated with the IP in the ARP table?  If you do look it up here www.coffer.com/mac_find/ and this may help identify what it is.

eb
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balwynhighAuthor Commented:
After cross referencing the Arp tables on the Cisco Switch with Mac addresses of Servers we found it.

Thanks
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Windows Server 2008

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