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initialization string" something like S10=50 . This sets the duration of DTR loss (in 0.01 s) after which hangup is
executed (check your modem manual, "US Robotics" modems may need something like S25=200). (2)
Call-waiting feature on your phone line may disconnect you when somebody tries to call you. (3) Old phone
cables and dirty or corroded phone plugs or sockets are a common source of problems. Check the connections,
replace the cables. Run the cables further away from sources of great electrical noise. (4) Too high modem speed
for your village long and noisy phone cables. Drop the modem speed (or move to a city). (5) Many ISPs will
diconnect you after some period of inactivity (30 min?).
If you keep having problems setting up ppp, you may want to try minicom to see if you can get your modem
working from there. minicom is something like PROCOMM for Linux. It should be present on your system if you
chose to install it during your RedHat initial setup. Here is a post from a newsgroup comp.os.linux.help which
explains how to start ppp manually using minicom (edited for space):
From: mark Subject: Re: pppd problem with kppp
BachuZ wrote:
>>Also, for an experiment, try using minicom to connect to your ISP, start ppp manually ... this can prove buggy
scripts. >how would u do that?
Easy!! If your ISP doesn't allow a manual logon then you might be in trouble. Every ISP I've ever used does allow
this, so.. 1. Start minicom. 2. dial your ISP. 3. Log in. 4. AFter your ISP starts PPP, quit minicom with ALT-Q
(or whatever the sequence is to 'quit without reset'). 5. start pppd, eg:
pppd -d -detach /dev/modem 115200 &
OK, PPP will be running. Try pinging your ISP or another known IP address. That will test everything is OK.
BTW, this is all in the PPP-HOWTO. If you can get PPP running this way, then you have a scripting problem. If
PPP doesn't work, you have a PPP configuration problem. Cheers.
Command line. If you would like to start your ppp from the command line, run netconf (as root) to configure
your first ppp interface (ppp0). The information you must enter is similar to what you entered when setting up
kppp (have a look above!): the proper device for the modem port, modem initialization and dialup strings, the
telephone number of your Internet Service Provider (ISP), the proper authentication protocol (by entering the login
name and password into the right slot). In older versions, the netconf utility lacked a place to enter the IP
addresses of my ISP DNS server, so I edited the file /etc/ppp/pap-secrets (I use PAP authentication
protocol) and added the two DNS IP addresses at the end of the setup line which was created by netconf so it
looked like this:
# added by linuxconf
my_login_name ppp0 my_password 111.111.111.111 222.222.222.222
When done with the settings, I could start my ppp0 interface using the command (as root, unless I specified in
netconf that normal users can start the interface):
Part 4: Linux Newbie Administrator FAQ 89
Linux Newbie Guide by Stan, Peter and Marie Klimas 01/08/2003
ifup ppp0
and shut it down with
ifdown ppp0
Setting up the command line ppp was not more difficult on my machine than running kppp and the connection is
more reliable for me. There is lots of command line scripts to start/stop ppp, but they apparently are not so easy to
set up and use, and many newbies seem to have problems with them. Badly misfired ppp connections can be killed
without rebooting using (as root):
killall pppd
If this minimalistic setup of ppp does not work for you, here are some useful links:
Roderick A. Anderson wrote:
I have a web page on setting up diald to work with RedHat Linux 5.x that works for me every time. It is at
http://home.altoplanos.net/~raanders/diald.html
Bill Unruh wrote:
I just wanted to bring your attention to the page http://axion.physics.ubc.ca/ppp-linux.html for detailed
instructions for setting up ppp. This is especially for cases in which the remote side uses (perhaps without the ISP
even telling you) PAP or CHAP. While kppp is useful, there are a number of situations where it can fail.
4.5.4 How to browse the net from my networked computer without a modem?
Another computer on your network must have a modem (or another Internet connection) though :-). Set up IP
masquerading. This way, all requests going from your network to your Internet Service Provider (ISP) appear to
have originated from a single computer, and your ISP will let them through.
ON REDHAT 5.2, simple masquerading required just one command (on the computer with the modem):
/sbin/ipfwadm -F -p m
This sets up masquerading as your default forwarding policy of your IP firewall, and therefore is insecure but
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