After upgrading to kernel 2.2.5, I have run into a number of problems
using pppd. The latest seems to be that although I can establish a
connection via modem with no problem, pppd immediately dies with the
message: "ioctl: (PPPIOCGUNIT): operation not permitted (1)". I checked the
docs with the new distribution and the only thing that seems relevant is
that you may get an error such as this with an incompatable or older version
of pppd. My version is 2.3.5, which as far as I know is pretty recent.
Hoping that this is a pretty common phenomenon, and that someone with
more experience might have encountered it before. If this rings a bell with
anyone please let me know.