How to put a linux device between WAN port of router and the external firbre eth interface for network analysis

[Shaggy1]

Hi

I would like to do some analysis of the traffic coming out of my router and thought I could do this by connecting a device (probably a RPi) to the WAN port of my router where I could route it on to the network and then do whatever analysis I want on the RPi.
Does anyone know if this is possible and if so how I would configure the routing such that traffic is forwarded from the interface connected to the wan to the interface connected to the network ?
I assume I'd have to use some form of bridging configuration to do this, but am not sure.

 

[degrub]

Use a switch that allows cloning the packets to a different port. Then hang your monitoring device off that port. Probably an x86 based box

 

[Digilog]

Well you don't have to do anything special. The router just has to have the capability.
To use something like wireshark, you would set up a remote tcp dump connection.

But the router has to have ssh access as well as the tcpdump command. So it depends on the router you have.