A static IP address is exactly what it sounds like–static, fixed and unchanging. My ISP (providing fiber optic service) has told me that they will be able to provide 2 static IP addresses through the single fiber optic line to the house. A standard RJ45 (I believe that's what it is) ethernet cable enters the house that will, presumably, carry both of these IP addresses. Static IPs cost a little extra on top of your regular internet service fees, but the additional cost is usually minimal. If you switch providers, change connection types, or need failover capabilities, you lose your IP address—and potentially your entire network configuration.