I used to do this type of configuration at home when I needed it to do test with routers or setting up new network for friend and family, but ever since I upgraded my residential ASUS router for a Netgate SG-3100, i am unable to connect a router behind it and been able to browse the internet behind the second router (which the primary LAN is connected to the WAN port on the second router) I have disabled the RFC1918 on the SG3100 but no luck what do I need to do on the SG3100 to allow the traffic from the second router to reach the internet back and forth.
Here is a text diagram of my network and what I want to do:
ISP GATEWAY ----|
|— CISCO SWITCH 2600
|— UNIFI AP (UAP-AC-LITE)
| |IoT VLAN
| |Office, Family & Guests VLANS
|— Computers/Laptops (Family VLAN)
|— My Computer/Laptops (Office VLAN)
|— Test Router (LAN -> Connected on the WAN on this router)
|— Test Laptop
By the way I can ping 188.8.131.52 from the test laptop but I cannot browse the internet, it does not resolve the name)
also Firewall rules in the LAN are the default rules, i am not filtering any DNS or DoH traffic out, but I am using DNS over TLS for my DNS queries.
Thank you in advance