I am running fedora12 in my machine and used virtualbox. I have 3 virtual machine running linux, xp and fedora as well. I have used linux as my gateway and configured NAT for my xp and fedora machine which is under the ip of 192.168.1.0 network.. Everything is fine but often i get error message in my xp machine that says 'there is an ip address conflict'.
I just wonder there are only 2 machine on that network and how can there be a ip conflict(i have used a static ip for xp and fedora virtual machine).My ip address for linux is (192.168.5.x and 192.168.1.101). XP (192.168.1.1). Fedora (192.168.1.50).

I have found that xp is usually correct.

How did you enable the networking. Bridged or shared or what?

Did you accidentally bridge your virtual network to your physical network?

Running nmap on your virtual network may reveal something.

Hi, Thank u very much
I have enabled my network via bridge to eth0. All other hosts in our network are under the network of 192.168.5.0 . Only my two virtual machine are in 192.168.1 network. But sometimes we use routers that have 1.1 ip by default. Is this the case how conflict happens? But my machines are behind NAT?

There is some other machine real or virtual or even part of the VM that is causing it. You have to isolate or do tests to be sure.

Not sure I completely understand what you've done with your network(s), but how painful would it be to change the XP host's IP to .2?