Paul "Rusty" Russel is the demigod currently in charge of developing the different IP firewalling systems in Linux. These come in three flavors, IPfwadm, IPchains and IPtables, with IPtables being designed by Rusty more or less from scratch. He lives in Adelaide, Australia and spends most his time hacking away at kernel or desktop code and answering e-mail from people like you and me when our firewalls break down.