i’d have said that’s less important than TLS or something on your ATM, a VLAN for ATMs that can only access specific services, and all ports not on a VLAN just disabled
really you just want to stop traffic from being sniffed (stolen credentials) and spoofed (“correct - dispense $10000”), and then to make sure it and nothing adjacent to it can access less robust services… beyond that, you just have to assume nothing. the services that an ATM connects to should be robust enough that they do all the validation - the ATM is pretty dumb (kinda in the same way as your browser on your computer: it gets no decision making to access your bank; just is input and output)
MAC addresses are easy to spoof, and physical security is pretty difficult on something like an ATM that’s publicly accessible… plugging into a switch should honestly be a nothing burger… having it publicly accessible - even on the same VLAN as an ATM - shouldn’t be a problem other than defence in depth
Ahh, i remember how my older brother locked down my internet access after midnight on behalf of my parents, boasting about having set up a MAC-address whitelist in the router some 15 years ago.
About a week later or so he proceeded to play Battlefield 3 on his early Samsung smartphone all night during summer holidays.
i’d have said that’s less important than TLS or something on your ATM, a VLAN for ATMs that can only access specific services, and all ports not on a VLAN just disabled
really you just want to stop traffic from being sniffed (stolen credentials) and spoofed (“correct - dispense $10000”), and then to make sure it and nothing adjacent to it can access less robust services… beyond that, you just have to assume nothing. the services that an ATM connects to should be robust enough that they do all the validation - the ATM is pretty dumb (kinda in the same way as your browser on your computer: it gets no decision making to access your bank; just is input and output)
MAC addresses are easy to spoof, and physical security is pretty difficult on something like an ATM that’s publicly accessible… plugging into a switch should honestly be a nothing burger… having it publicly accessible - even on the same VLAN as an ATM - shouldn’t be a problem other than defence in depth
Ahh, i remember how my older brother locked down my internet access after midnight on behalf of my parents, boasting about having set up a MAC-address whitelist in the router some 15 years ago.
About a week later or so he proceeded to play Battlefield 3 on his early Samsung smartphone all night during summer holidays.