This chapter contains solutions for several non-trivial network configurations. The first section discusses the interoperation of dCache with firewalls and does not require any background knowledge about dCache other than what is given in the installation guide (Chapter 2, Installing dCache) and the first steps tutorial (Chapter 3, Getting in Touch with dCache). The following sections will deal with more complex network topologies, e.g. private subnets. Even though not every case is covered, these cases might help solve other problems, as well. Intermediate knowledge about dCache is required. Since most tasks require changes in the start-up configuration, the background information on how to configure the cell start-up, given in Chapter 6, The Cell Package will be useful.