I was just reminded of this and thought others might enjoy reading it...
Customer Review
https://www.amazon.com/gp/customer-reviews/R2VDKZ4X1F992Q/
PING! The magic duck!
Using deft allegory, the authors have provided an insightful and intuitive explanation of
one of Unix's most venerable networking utilities. Even more stunning is that they
were clearly working with a very early beta of the program, as their book first appeared
in 1933, years (decades!) before the operating system and network infrastructure were
finalized. ...
-r