Looking for some guidance is it possible to configure the router in passthrough mode with IPv6? I tried multiple things including enabling IPv6 DHCP server, disabling IPv4 server, forcing to obtain IPv6 from the ISP. Neither my Fortigate 60E or Windows 10 host (directly connected to the router) are getting the IPv6 address on the interface.
I’ve attempted to do the same exact setup as you’ve described. I’ve forced the PDP Type to be IPv6 on my mobile interface and have done nothing else. After confirming that the interface now had an IPv6 address, I’ve connected my laptop directly to the LAN of my device (RUTX11) and reviewed my IP address via the ipconfig command in the Windows CMD:
I have not changed any DHCP-related settings whatsoever, although, I had to ensure that Delegate IPv6 addresses was enabled on my Mobile interface settings under the IPv6 Settings tab: