To Enable IPv6 on the Firewall
IPv6 firewalling is enabled under Device > Setup > Session:
*** You may have to restart your Firewall for IPv6 to be enabled.
On the CLI
# set deviceconfig setting session ipv6-firewalling [yes|no]
Here is the interface configuration I used:
Don’t forget to add a rule in your security policy that allows Your new IPv6 interface to talk to your Gateway.
Add Default Route
You will also have to add a default route under Network > Virtual Routers > Default > Static Routes > IPv6
The default route for IPv6 is ::/0 the next hop is the default gateway address