Re: Keeping pppd alive--how?

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Date: Sat, 30 Oct 2004 18:18:41 -0500

In article <ueu6o013atv2c38a6pq29kaus8i0s6crsj@4ax.com>, Phisherman wrote:

>>> Sometimes a family member will startup this script if I am
>>>not present. I always have this computer logged in as root--I know
>>>this not a good idea, but physical security is not a big concern.

So make /usr/sbin/pppd SUID, then anyone can run it. Personally, I
start pppd out of the boot scripts, and run it in the demand mode, so
that it brings up the link as needed. See the options "demand", "idle",
and "holdoff" if you want to do that.

>>>Here's my script (called s) that dials up the ISP and starts the
>>>firewall:
>>>
>>>#!/bin/sh
>>>#
>>>./ppp-on
>>>sleep 40s
>>>./fire

Run the 'fire' script out of /etc/ppp/ip-up (RH wants you to _create_
/etc/ppp/ip-up.local instead - probably a good idea). See the pppd man
page under SCRIPTS.

>My ppp-on script contains only one (rather tricky with the single and
>double quotes) command:
>
>/usr/sbin/pppd name "xxxxxxxxx@worldnet.att.net" -d connect
>'/usr/sbin/chat -t 45 ABORT BUSY "" ATDT824xxxx CONNECT ""' /dev/modem
>115200 noipdefault modem defaultroute crtscts

1. Loose the '-t 45' as that is the default for chat
2. Grab your modem manual and find out what the correct init string is.
3. Replace the "" after the CONNECT with \d\c
4. Rather than 'name "mumble"', I'd use the 'user "mumble" option'
5. Look in the man page for pppd, and discover what "persist" does.

Using 'killall pppd' is correct. The rational for step 2 is that you
have no idea what the modem is doing before you talk to it. AT&F0 or AT&F1
is probably what you want - ATZ is _definitely_not_ it. The rational
for step 3 is in the chat man page. Briefly, /d says to wait one second
(after receiving the "CONNECT" string), and the /c says to exit chat without
sending the newline character that may screw up some terminal servers. Your
empty quotes send that newline and that is not desired for portability.

>Perhaps there is an option in the pppd command that will keep my
>connection alive? Anyone know?

Did you look in the man page? It's there as noted above.

        Old guy

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