I'm with Andrew on reservations in the DHCP table, that's the best method at least in my case, I have lots of devices connected and if they're statically assigned DHCP addresses then it's simply a matter of adding the MAC addresses to the router's static DHCP table. I use that method because I change routers fairly frequently, we do a lot of VOIP networking between PABX's and I often need to test routers for suitability before installation.
Another good trick is to set your PC as static adress with manual gateway and DNS setings and enter a number of alias IP's in the advanced TCPIP settings. That way it's possible to have for example, your LAN and router in the 192.168.1.x range, another device in the 10.0.0.x range, yet another in the 172.22.50.x range. We use that technique at work as the PABX's we install all come with different default IP addesses and often we need to access documentation on the LAN as well as download patches, licencing & sotware updates and program the PABX without changing it's IP address.
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