Re: PPP

[Marcus Brinkmann]

On Fri, Jan 04, 2002 at 06:47:02PM -0500, Roland McGrath wrote:
> > I set the speed of the serial line to 19200 by this:
> > stty speed 19200 < /dev/com0
> 
> Why do you have to?  Doesn't ppp set this speed itself?

I don't think so, but I have not verified it.  I surely had trouble without
that.  And what I forgot: I had to run minicom to at least once after
booting, because some serial line attributes seemed to be wrong (I received
garbage).
 
> > I set up pfinet (after killing it with kill -9):
> > settrans /servers/socket/2 /hurd/pfinet -i tun0
> 
> Does settrans -gf not work?  

It didn't work always for me.  I think if there is a parallel ethernet
configuration, and inetd is running, it refuses to go away.  Or something
like that.
 
> > (you can add -i tun0 to your existing configuration to have ethernet and
> > ppp).
> 
> Does it also work to add it with fsysopts to test before changing the
> translator setting?  If that works you can do that to update the current
> state and then use settrans -pk to change it for the next boot, without
> ever killing pfinet.

Yes, fsysopts /servers/socket/2 -i tun0 seems to work fine.
 
> > I can do some of the things Neal described in one of the posts here.
> > For example, I can ftp to the other machine, and download a small file
> > (smaller than 500 bytes).  But larger files are not retrieved.  On the Hurd
> > side, "show hdlc" shows bad frame check sequence fields errors.
> > On the GNU/Linux side ifconfig shows receive errors, too.
> 
> That sure sounds like serial port problems to me.  
> Have you tried really low speeds?

Oh my!  Indeed, it works with 600 and 4800 baud, but not with 9600 or
higher.  But this is interesting, because the test program by Diego, which I
cat'ed over the serial port did not show any serial port problems at these
speeds.

telnet also works.  The "no echo" problem is no more.  
 
> > The main candidates for the problems are um-pppd (in particular the tty
> > backend of it) and the term translator.  Neal and me tested ppp over 
> > ethernet
> > (_not_ what you know as PPPoE), and it worked just fine.
> 
> You mean PPP over TCP or UDP, right?  (That might or might not actually be
> over Ethernet.)

Yes, you set up a service at the other host (we used a BSD system) and
configure the local ppp to send its data over a socket.

I will try some pty stuff as soon as I understood it.  I had some vague
ideas that pty would be the way to make some term tests, but I had no idea
yet how to go about it.  Your suggestions are highly appreciated and will be
turned into a test session soon.

Now I will enjoy my ppp connection at 500 bytes a second.  Because we don't
have any PCMCIA support, that's the best network connection I can get on my
laptop under the Hurd.  But hey, I don't complain.  It's great to not have
to reboot just to install telnet!

Thanks,
Marcus

-- 
`Rhubarb is no Egyptian god.' Debian http://www.debian.org brinkmd@debian.org
Marcus Brinkmann              GNU    http://www.gnu.org    marcus@gnu.org
Marcus.Brinkmann@ruhr-uni-bochum.de
http://www.marcus-brinkmann.de