|Since you're talking about an IP provided by your ISP, no, you can't give it to a client PC behind your router and expect it to work. In order to use this IP directly on the PC, you'd have to configure it on the PC's NIC (and all other pertinent TCP/IP settings such as DG, DNS, SM) and then take the network cable going from your modem to your router out of the router and plug it in to the computer.|
Perhaps if you explain what it is you're trying to do, we can help you with that.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.