Chapter 1 What’s New for FortiOS 5.0 : IPv6
  
IPv6
In order to configure IPv6 features using the web-based manager, IPv6 must be enabled using Feature Select. For more information, see “Feature Select”.
The following new IPv6 features are available from the FortiOS 5.0 web‑based manager:
IPv6 Policy routing
IPv6 security policies
IPv6 Explicit web proxy
IPv6 NAT – NAT64, DNS64, NAT66
IPv6 Forwarding Policies - IPS, Application Control, and flow‑based antivirus, web filtering and DLP
New Fortinet FortiGate IPv6 MIB fields
IPv6 Per-IP traffic shaper
DHCPv6 relay
FortiGate interfaces can get IPv6 addresses from an IPv6 DHCP server