Specify an address of my mac on host-only/nat adapter

Specify an address of my mac on host-only/nat adapter

I installed VMware Fusion 3 to my Mac (running 10.5.4), and I am trying use it. But, I usually set NAT/HostOnly adapters' address to somewhere 10.0.0.0/8 range (e.g. usually I use 10.0.80.0/24 for vmnet8) for avoid collision with the future changes on real network (which falls into 192.168.0.0/16 range).