Since each user will normally have its own IP address, commercial testing products (such as HP LoadRunner, WebLOAD, and others) can use IP spoofing, allowing each user its own "return address" as well.
由于每个用户都会有自己的IP地址，商业测试产品（如HP LoadRunner（英语：HP LoadRunner）、WebLOAD等）可以使用IP欺骗，同样允许每个用户自己的“返回地址”。