Hardware Dependent
# Uncomment if you need to run non-passive FTP
#map ep0 <-------- -> 0/32 proxy port ftp ftp/tcp <--------
User Choice
# THESE are the only two lines that actually are needed
map ep0 -> ep0/32 portmap tcp/udp 10000:20000
map ep0 -> ep0/32  

Red hardware dependent
Purple variable (user choice)
Black same for everyone
Green dependent on outside circumstances (e.g. ISP)