pe...@easthope.ca wrote:
> PPP over a serial crossover cable between two machines.  

Fun retro!  :-)

What clues are found in the mgetty debug log file?

> If mgetty is started interactively by root, PPP works, including PAP.
> I haven't found any effect when the mgetty command is in /etc/inittab. 

The default commented out entry in Debian for years and years has been:

  #T3:23:respawn:/sbin/mgetty -x0 -s 57600 ttyS3

Since you have a serial line without a modem I assume you are trying
something like this in your inittab?

  T0:23:respawn:/sbin/mgetty -r -x0 -s 57600 ttyS0

Try cranking up the debug level.  Then look

  T0:23:respawn:/sbin/mgetty -r -x5 -s 57600 ttyS0

> mgetty provides the ringback protocol.  For years that allowed dialin
> to a modem on ttyS0.  The crossover cable with PPP was on ttyS1.

Do you have it connected to a modem?  If not then do you have -r to
avoid the modem initialization?

Bob

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