Online checkout and clients on the same subnet in a cafe - dangerous?

Question

network hardware

I was sitting in a cafe today, the landlord came (apparently) and the employees complained to him about the long answers of the online cash register. The cafe is impassable. So there is no load as such. From the conversation, it became clear that the access point for customers of the cafe and the online cash register is the same and it became interesting: 1. What is the reality, potentially, maybe? 2. Will attackers be able to somehow hack an online cash register while on the same subnet? 3. Can they steal customer card data and so on? How realistic is this at all, and if you shouldn’t do this, then how can they organize a network? Maybe thanks to the answers, I will help people from potential trouble! Recently I watched a video from Topless about the cyber-robbery of the century, and I was even wary. Thanks for answers.

Answer 1

1. How to set up
2. If not completely gouging, then no. Just in case, check the CVE for your router model
3. Depends on the network. In the general case, the piece of iron knocks on its network via SSL and at the output it gives confirmation and reject
Hmm, well, let them organize a guest wifi network, a payment network and a cash register to another network (vlan) everything else in 3.
There are ready-made solutions from network equipment manufacturers.
There and registration of guests, and accounting for their network activity and billing.

Answer 2

It is good practice to isolate the guest network from the work network. Make clients a separate wifi network without access to a working one, if the router allows.