This month I hit my data cap (again) and after looking up how accurate ISP data usage meters really are, it got me thinking about something.
With ISP data caps measuring traffic in/out of the modem WAN, if you were to start sending broadcast packets out to the network broadcast IP (or maybe ARP requests to a group of IP addresses within your subnet), would this eat away at every modem's data cap that is also on the same subnet as your IP? Or are ICMP / broadcast packets not counted towards the data cap?
Anybody have details (or theory) on how data usage is actually calculated?
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