Re: FortiOS 6.4.0: How to use Q-in-Q vlan interface?
Have you made any progress with this? I have 2x200F HA units that I am trying to get working with QinQ tagging. Our ISP is handing off VLAN tagged frames to the FG, where we need to strip the outer tag to then allow the tagged (Nested) VLANS to reach their corresponding FG interface/vlan. We then send out "double tagged" frame with the outer matching the client/customer site. THe provider then strips outer VLAN when frames arrive at site and before hitting switch interface, so we are left with layer 2 destination VLANS. Provider then accepts single tagged packets on the return and tags them on the 'outside' with the 'site' vlan with the single tagged frames encapsulated inside before they reach the FG.
I've been waiting on answers from FG support for a few days. I've been told several times that it is an 'advanced' feature that is "rarely" used which is interesting because the features/options are there are were added to firmware recently and for good reason, you would think?