IPv6 support for GRE tunnels
You can use IPv6 addresses can be used at both ends of a GRE tunnel in the same way as with IPv4.
The configuration is similar to how you set up the tunnel for IPv4. However, when you configure the specific tunnel, you need to set the ip-version
option to 6. This will enable IPv6-specific options for the tunnel.
CLI
config system gre-tunnel
edit <name of tunnel>
set ip-version 6
set remote-gw6 <IPv6 address of the remote gateway>
set local-gw-6 <IPv6 address of the local gateway>
end