In the kernel comfiguration menu that shows up we enable quota, iptables and the dummy network driver as modules. This is where you enable these modules:

File systems --> [*] Quota support
                     <M> Old quota format support
                     <M> Quota format v2 support

Device Drivers ---> Networking support ---> <M> Dummy net driver support

Device Drivers ---> Networking support ---> Networking options ---> [*] Network packet filtering (replaces ipchains) ---> IP: Netfilter Configuration ---> <M> IP tables support (required for filtering/masq/NAT)