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this post was submitted on 31 Jul 2025
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Spoofing a MAC is easy but it still requires knowing both what an existing valid address is, and ensuring that it's not already connected to the network. It's only operational overhead when a new device is onboarded, after that the impact is minimal.
A policy that requires sending a tech is fine, but if you have hundreds or thousands of individual locations then you aren't going to have a tech onsite at every one of them to quickly check and fix an issue, and you don't really want to have to trust an end user to verify and/or make physical changes on site if you can avoid it.
Don't really need to send a tech immediately. More efficient to get a gas station clerk (or whoever works where the ATM may be located) to verify nobody is trying to fuck with it on-site and they didn't lose power/internet at their location, before escalation.
This is still trivial. A Pi with 2 NICs and a Linux bridge. Using the 2 ports, effectively put the Pi in between the device you want to spoof and the rest of the network. Now you can see the traffic, the MAC addresses etc.