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Re:Sorting 1M 8-digit numbers in 1 MB of RAM (2012) by perl4ever on Sunday March 29, 2020 @05:50PM (#22723090)
"Once COUNTER reaches 1000000, you have all of the values stored in the incessant stream of ICMP requests"

This sounds to me like...

https://en.wikipedia.org/wiki/Delay_line_memory

Re:Sorting 1M 8-digit numbers in 1 MB of RAM (2012) by jfitzsimons on Monday March 30, 2020 @05:12AM (#22726349)
It's complicated by the fact that ICMP packets do not necessarily arrive in order.