ICMP delay-line memory (or, in this case, ICMP Williams tube). That it's used for maintain the state of a simulation of the Manchester Baby is too cool!<p>See also:<p>Pingfs – a filesystem where the data is stored only ICMP Echo packets: <a href="https://news.ycombinator.com/item?id=9844725" rel="nofollow">https://news.ycombinator.com/item?id=9844725</a><p>Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM - <a href="https://stackoverflow.com/a/13000176" rel="nofollow">https://stackoverflow.com/a/13000176</a>
I saw this somewhere else and then went to submit it... I was brought here, at which time I realized I have already even upvoted it :/<p>I think I need some sleep.