I presume that you have the program ppp_relay which you say he wrote. You will
have to look into that to see what it does.
man pppd
pty script
Specifies that the command script is to be used to commu-
nicate rather than a specific terminal device. Pppd will
allocate itself a pseudo-tty master/slave pair and use
the slave as its terminal device. The script will be run
in a child process with the pseudo-tty master as its
standard input and output. An explicit device name may
not be given if this option is used. (Note: if the
record option is used in conjuction with the pty option,
the child process will have pipes on its standard input
and output.)
pppd connects it stdout to that program's stdin, and stdin to that program's
stdout. Ie, that program is responsible for all communications with the phone.
You will have to look at it to see why no responses are generated. ( you could
also look at the debug output of pppd to see what pppd is seeing-- you can up
the log level to get more detailed info.
pppd uses the daemon log facility of syslog for its error messages.
iYou need something like
daemon.* /var/log/daemonlog
in /etc/syslog.conf
to get the stuff output to the file /var/log/daemonlog.
See the entry for "debug" in man pppd
On Wed, 28 Oct 2009, tony.chamberlain@xxxxxxxxx wrote:
This is somewhat different from my other question and is on a different
system and of course the person who developed it left.
There is a mobile phone which connects to a CDMA BTS and then from there
to a Linux machine. A process called pdsn is running on the linux machine
and detects when the mobile phone calls. It then spawns a process with
a bunch of parameters (port, ip, etc) like this
pppd pty 'ppp_relay -p port -a address ...'
So pppd uses ppp_relay (which is also something he wrote) to handle the
ppp stuff.
Now this worked on Red Hat 9 but there seems to be a problem on CentOS 4.5.
From what I can tell, ppp_relay receives a TCP port number (I guess from
pdsn?) and tries to communicate to the pppd process through this port.
It sends a message but never gets a response.
I am curious how the pppd pty process (in this case ppp_relay) communicates
to pppd? We did a netstat and found pppd but no TCP nor UDP ports were
associated with it. It was just a UNIX-type process.
Is ppp_relay attempting to talk through a port when it should be using
some kind of Linux message?
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