For mobile applications such as software demonstrations, a single laptop or notebook computer is used as both the FLEXnet license server and client. However, laptops and notebooks usually employ the DHCP protocol, in which the IP address is always changing. This causes the FLEXnet license check out to fail, and the licensed software will not run.
Here I present a system configuration that allows FLEXnet to work with DHCP connected to different networks, or connected to no network at all. This configuration is tested on Red Hat Enterprise Linux 3.0 and 5.0.