I am seeking advice on the security aspects of the configuration of my home system. I have 2 PC's, connected to the internet via a firewalled NAT router. The main PC is an i386 P4 used for general computing, the second is an older i386 P3 which I intend to dedicate to internet banking for maximum security. I have installed OpenBSD on the P3 with just the xfce4 window manager and the Mozilla Firefox browser. Both PC's have separate printers.
1: The P3 will only ever connect to bank websites, which I have to assume are 'clean' (I might be able to disable scripting for some sites). However malware may conceivably infect the main PC. Am I right in assuming I need to run PF within OBSD on the P3 to protect against possible intrusion across the LAN? Would this be enough? Also even within this minimal installation, are there services which I could/should disable? 2: Space for the P3 is limited and I would like to remove its printer and print bank statements across the LAN on the main PC (running Linux, or maybe FreeBSD in future) using CUPS. Does this introduce security risks? Any helpful comments would be much appreciated. Russell