Networking :: PPPOE vs static inet configuration

Hi,
Here is my problem : I can't configure my connection with PPPOE.

My previous internet config was using an eth0 interface with a static IP address. I have nodhcp in the lilo.conf file.

From this config, I had to change to a PPPOE. Knowing that my kernel supports it and that the PPPOE packages are installed (via synaptic), I start the PPPOE configuration on the DSLPanel. Everything is going fine. There is no errors.

Then, I write $ pon in the terminal. It goes to the next terminal line without giving anything wrong. But if I type $ poff, it gives me " No ppd is running . None stop"

In the var/log/messages, I also have
"Couldn't set tty to PPP discipline : Invalid argument
PPP session is 4335
read (...) session 4335:Input/output error"

Would you have any idea on what I did wrong during this configuration???
Thanks a lot
Bill_oute

I forgot to metion one thing : the command ifconfig still returns me eth0, and not a ppp0 interface.
Thanks for any suggestion!

Instead of the normal message:
[root@machine user]# grep pppd /var/log/messages
... pppd[25864]: Plugin pppoe.so loaded.
... pppd[25864]: PPPoE Plugin Initialized

the "messages file" give messages like :
" ... Couldn't set tty to PPP discipline: Invalid argument ... "

and it's not possible to start the 'pppoe.so' plugin , I dn't see this plugin loaded and initialized.

our pppoeconf is correct
but it's not possible to have a PPPoe connection
no messages are given when we run PON
and 'No pppd is running; None stopped " with POFF

And in the ifconfig we have line for:
eth0 ...
l0 ...
but not the lines with the pppO informations

thanks for your help

Thnks for your help

original here.