Default Kernel?? *Don't think so. *I think you should compile everything required for your firewall design into the kernel. *Don't load them as modules. *You have plenty of room, as long as it's only for a firewall and not for a "real" box. *Yeah, do the expert install thing and pick every program by hand...I did a full install(because I'm a little lazy) and then wen't back and did a mass uninstall to trim down the system. *You definitely need kernel source though. *good luck
Oh yeah, on my slack 8.0 box I don't think the kernel had netfilter compiled in...or anything related to iptables for that matter.