I mean... you have both -ixon and -ixoff in the example you gave. Surely it shouldn't be both.

err, yes, it is both. -ixon disables XON/XOFF processing on the input stream, and -ixoff disables the generation of XON/XOFF codes in the TTY driver.

the hyphen before each of the option names means disable, so the opposite of -ixon is simply ixon, not -ixoff.

man stty is your friend.

--dan.