This chapter describes the compiling and setting up of iptables, the
new routing tool for Linux kernels 2.4.x. This chapter doesn't want to
introduce in the world of building hard core firewalling systems
nor discuss a reliable und reasonable security level for gateways.
For such reasons, please read Oskar Andreasson's great tutorial
for iptables [Andreasson02]. This chapter merely wants to
show the necessary steps for compiling and installing the needed tools
for using the tutorial mentioned above. Beyond, we create one simple
firewalling rule for using the SEGA Dreamcast as a
MASQUERADING router for LANs.