I am not 100% sure, but can you take a look at this article and see if it describes what you are looking for?
It does not, but thanks for the attempt. The M and O flags provide a way for you to configure how you are going to assign IPv6 addresses to other devices on the network, either via SLAAC or DHCP. You still have to manually assign a static IP to the interface (referenced by looking at the screen shot in the article).
We need to be able to obtain an IPv6 address on the interface dynamically via DHCP. And then more importantly be able to support prefix delegation. With prefix delagation, the provider hands you a delgated prefix over DHCP as well. The firewall needs to be able to receive that and know what to do with it.
With other solutions that support it, there are usually options on the interface configuration that allow you to send an IPv6 prefix hint to indicate the desired prefix size for delegation. That is typically done on the external or WAN interface. Then there are typically options on the interface settings that you would set on your LAN interfaces to tell them to "track" the WAN interface to get their IPv6 addresses / delegated prefixes.
Without support of these two options, PAN is basically incapable of routing IPv6 to/from the internet.
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