DHCPv6
You can use DHCP with IPv6 using the CLI. To configure DHCP, ensure IPv6 is enabled by going to System > Config > Features and enabling IPv6.
Use the CLI command
config system dhcp6
For more information on the configuration options, see the FortiGate CLI Reference.
DHCPv6 relay
You can use the following command to configure a FortiGate interface to relay DHCPv6 queries and responses from one network to a network with a DHCPv6 server and back. The command enables DHCPv6 relay and includes adding the IPv6 address of the DHCP server that the FortiGate unit relays DHCPv6 requests to:
config system interface
edit internal
config ipv6
set dhcp6-relay-service enable
set dhcp6-relay-type regular
set dhcp6-relay-ip 2001:db8:0:2::30
end