Fortinet MR1 - Manual (Page 131)

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Default Setting
None
Command Mode
Global Config
5.3.1.10 ip ipv6
This command is used to enable the Ipv6 function on specific interface.
Syntax
ip ipv6
no ip ipv6
no - disable IPv6.
Default Setting
Enabled
Command Mode
Interface Config
This command is used to enable the Ipv6 function on all interfaces.
Syntax
ip ipv6 all
no ip ipv6 all
all - All interfaces.
no - disable IPv6.
Default Setting
Enabled