Chapter 7 Firewall : Firewall objects : Virtual IPs : Dynamic VIP according to DNS translation : Syntax
  
Syntax
config firewall vip
edit "1"
set type dns-translation
set extip 192.168.0.1-192.168.0.100
set extintf "dmz"
set dns-mapping-ttl 604800
set mappedip "3.3.3.0/24" "4.0.0.0/24"
end
end