setup_loopback () {
  ############ 
  # Only in rare cases do you want to change these rules
  #
  ${fwcmd} add 100 pass all from any to any via lo0
  ${fwcmd} add 200 deny all from any to 127.0.0.0/8
  ${fwcmd} add 300 deny ip from 127.0.0.0/8 to any
}