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)