Yeah I think my idea was to be able to go yup your copier is getting spammed please fix your network.

I've got a managed switch now with port mirroring capability now just need to have a play with it.

The idea would be ok Mr customer let's see what's going on oh look it's getting spammed by these ips etc. I liked the idea of the router because you could go yup it's your CCTV system on port 489 ok let's just filter that out... Yup that's your problem goodbye.

I did have a play with a mini router but I've got no idea how you'd configure it to basically act like a switch and forward everything from the wan side to lan so we could still make use of the firewall if needed. Yeah I think you guys are right introducing another router into someone's network probably not a great idea.