System Settings : Network : IPv6 static routes : Add a IPv6 static route
 
Add a IPv6 static route
Go to System Settings > Network, select the IPv6 Routing Table button, and select Create New to add a route, or select the route number to edit an existing route.
Figure 62: Create new route
Configure the following settings, then select OK to create the new IPv6 static route:
Destination IPv6 Prefix
Enter the destination IPv6 prefix for this route.
Gateway
Enter the IPv6 address of the next hop router to which this route directs traffic.
Interface
Select the network interface that connects to the gateway.