[thaumaturgy]

Unfortunately for my original point, it looks like my info was waaaay out of date, and most OSs started using cryptographically random ISNs years ago.

My bad, sorry for the noise.

edit: I suppose this means it's time for me to finally discard my copy of Inside TCP/IP, third edition. :-(

[khafra]

Don't just throw it away; it's great for ergonomics. Most people's monitors are way too far below eye level.