Can I connect the internet fiber to the CRS328 (who has 4 SFP+ ports) and configure the RB4011 to use that as default destination? This would however mean that all traffic from LAN to WAN has to go through the CRS328 - RB4011 connection to be routed and back to go to the internet. Assuming internet...

Hello @Jojolejobar.

Did you manage to get this setup work?
I am currently in the same scenario with basically same HW and I know this should be possible with usage of VLANs.