My ISP gives 2 devices to provide internet access: ONT+Router
I wanna use a router with an embedded ONT, so I only have 1 device.
The problem is that they dont give out the configuration for you to use your own devices, so using a exploit I gained admin access to the router, but the ONT is another history.
So I thought of sniffing the the traffic between ONT and router , using a OpenWRT device. I have read https://openwrt.org/docs/guide-user/firewall/misc/tcpdump_wireshark but it isnt enough detailed for my knowledge.
What I want to do, if possible, is to bridge 3 ethernet ports on the Openwrt device, and connect to each one of them the ONT, the router and a PC with wireshark to sniff the traffic.
How do I manage to do that? Also I have read that I need to use VLANs so the traffic is processed by the openwrt device's cpu, and make it sniffable.
The openwrt device is a ar5387un with the latest openwrt version.