[Kenji]

This only works with dedicated hardware, right? I can't just take an arbitrary board like the raspberry pi and do this?

[laumars]

No dedicated hardware required. Bridges can be placed on virtual interfaces. You often see this happen with things like VMs and containers but you don't even need that specifically.

[tyingq]

Works fine on a pi with either usb interfaces or virtual ones.

If you want to experiment at a low cost, though, there's the Banana PI BPI-R1. A ~$70 linux ARM dev board with 5 GB ethernet interfaces.

[pjc50]

You can even bridge an interface to a tun/tap device, which is quite useful for VPNs and doing your own packet-twiddling code.

[goyalankit]

It's a linux software bridge, and should work on raspberry pi.

[tr1ck5t3r]

Bridge works very well on a RaspberryPi within the physical hardware limits.

An example using bridge to packet capture. https://github.com/williamknows/PiTap

[cjcampbell]

Yep. Just finished teaching a networking course using the pi as the basis for labs and projects. Had a scenario that required students to set up a bridge. Just plug in a couple of usb network adapters.

[linsomniac]

You can also do this with a VLAN interface. At my recommendation, a friend set up Raspberry Pi at home connected to a VLAN capable switch to break that one Ethernet interface out to 7.