regarding PPPd NULL modem

[Venkat Hallale <venkath@xxxxxxxxxxxxxxxxxx>]

Hello all,
  I am using the pppd version 2.3.7-2 on redhat linux 6.0 with 2.2.5-15 
kernel. I using the following options for running the pppd .


/usr/sbin/pppd debug /dev/ttyS1 19200 auth debug kdebug 7 passive

It is not working with these options. This used to work for some times 
before. I have checked with the dmesg ring buffer contents. It is not 
showing any of the connection negotiations. it dispays the debug message 
as follows:

Apr 21 22:50:16 vindhyachal kernel: PPP: version 2.3.3 (demand dialling)
Apr 21 22:50:16 vindhyachal kernel: PPP line discipline registered.
Apr 21 22:50:16 vindhyachal kernel: registered device ppp0
Apr 21 22:50:16 vindhyachal pppd[1231]: pppd 2.3.7 started by root, uid 0


And some times it also displays the following message:

Apr 20 23:49:58 vindhyachal pppd[623]: pppd 2.3.7 started by root, uid 0
Apr 20 23:50:11 vindhyachal pppd[628]: pppd 2.3.7 started by root, uid 0
Apr 20 23:51:45 vindhyachal pppd[637]: pppd 2.3.7 started by root, uid 0
Apr 20 23:52:20 vindhyachal pppd[643]: pppd 2.3.7 started by root, uid 0
Apr 20 23:54:35 vindhyachal kernel: rs_close: bad serial port count; tty->count is 1, state->count is 3

 
And we are able to see that the pppd is running, if we give ps -el command.
The interface "ppp0" will be listed in response to the ifconfig -a 
command. But it is not UP.

what could be the problem with the pppd settings. Can anyone give me good 
pointers to attack this problem

All tests are done using the NULL modem cable.

Thanks in advance.

Venkat Hallale.