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Old 03-16-2010, 12:55 PM   #1
Registered: Jul 2005
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Question Dial-up connectivity problem: configure kppp with firewall, find lock files

I have a desktop computer running Debian Lenny, a 56 K modem, and a dial-up account, currently configured like this:

computer -> modem -> UPS -> phone jack

When I run off a Knoppix live CD, I can use kppp to configure pppd (using PAP/CHAP authentication and hardware control flow) to dialup and surf. When I try to user kppp to configure pppd exactly the same way on my hard drive installation, I get nothing. Both my Knoppix live CD and Debian Lenny use exactly the same version of kppp, but the pppd related files in /etc/ppp look a bit different.

Under both Knoppix and Debian Lenny hard drive installation, when I try to connect, the login debug window of kppp shows:
ATDT [phone number]
At this point I hear the modem dialing out, and when using Knoppix, after a few seconds I see
CONNECT [five digit number]/ARQ
which I think corresponds to my route to the InterNet being established through my ISP. When using the hard drive install, I never see the CONNECT, and all indications are that my modem is not sending authentication information at all, but getting stuck right after dialing out, so that my ISP gets a phone call from a modem which... refuses to speak. I never had any problems before, so I am baffled.

So apparently my system is currently misconfigured in some way which prevents point to point protocol from getting out.

  • I have a firewall on my computer which I set up using guarddog. I have enabled point to point protocol from internet zone to local zone. I know that ppp is a symmetrical protocol, but my understanding is that I do not need to enable point to point from local to internet zone. I have not enabled irc protocol because my understanding is that this is only relevant to software flow control using chat scripts. Does this sound correct? Is there some additional protocol I need to allow in order to use pppd to dial out?
  • When I reboot my computer (off the hard drive) I sometimes see that the system complaining about a failure to stop every process, and sometimes I see mention of an I have been looking for lock files; would they all be in /var/run?
  • When I use kppp to configure pppd, I want to do that as my ordinary user for at least two reasons, correct?
    • don't want to run pppd as root user for security reasons
    • kppp is a GUI and root user can't use X (on Debian)
    So I should see in home directory of my ordinary user
    but not in /root directory, correct? What pppd related processes should I see with ps -ef if everything is working?

Last edited by Peufelon; 03-16-2010 at 01:06 PM.
Old 03-18-2010, 08:46 PM   #2
Registered: Feb 2010
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try wvdial.
Old 04-01-2010, 10:55 PM   #3
Registered: Jul 2005
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Question Followup questions

I see that wvdial is available for Debian, but Catch 22: I can only connect when using Knoppix live CD on another machine right now, running kppp, so I can't use package manager to install wvdial and try it out.

Are you saying that if I purchase the Debian Lenny complete CD set, so that I can install wvdial off the CD, that wvdial will do better than kppp? Because from the package description, kppp sounds more configurable. The descripion says that with wvdial you don't need to use chat scripts, but as I understand it, I should not need to worry about chat scripts because I am using hardware control. My ISP says the problem may be that servers under my control don't know how to communicate with my old modem, which has not gotten firmware updates because the vendor does not support linux.

Does anyone know where to find the lock files for kppp?

Last edited by Peufelon; 04-01-2010 at 11:01 PM.


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