> I guess I don't understand what it means by expecting ftn packets on stdin.
> I read the README and the iftoss.8 and both say the same thing but I don't
> know what it means 'expecting the pkts on stdin.'
> I'm sorry, I don't mean to be so dense.
"expecting ftn packets on stdin" means exactly what it says. When you run
iftoss, it starts reading stdin, and it should read an FTN packet. E.g.
$ iftoss < 12345678.pkt
Normally you never need to run it by hand, as ifunpack does it for you.