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From: Jay Sachs <sachs@interactive.net>
Subject: Re: Tips : Dynamic PPP On-Demand Setup
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Date: Thu, 12 Dec 1996 16:10:29 GMT
Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:32455
> * Starting ppp on-demand
>
> 1) Initialize the tun0 device to some dummy addresses by typing:
> "ifconfig tun0 inet x.x.x.x y.y.y.y" at the shell prompt, where
> x.x.x.x is your localhost address and y.y.y.y is some other dummy
> address. eg.
>
> $ ifconfig tun0 inet 192.168.0.0 192.168.0.1
>
> * where 192.168.0.0 is my local host address. This address IS
> IMPORTANT and must be the same as the one found in the hosts file.
> * 192.168.0.1 is just a dummy address
This should be unnecessary. Also, an separate IP address for your own
machine in /etc/hosts is unecessary. You can stick the hostname you
chose (in /etc/sysconfig) as another alias for 127.0.0.1.
I don't ifconfig tun0. Many people I've spoken to have had problems
with ppp when tun0 is ifconfig-ed.
> - Patience... be prepared to wait between 20-30secs after trying to
> access an address (eg ping etc), before any modem activity starts up.
This shouldn't be. Not sure what the cause of this is. If I start a
ping, or anything else, the modem starts up almost immediately. routed
might interfere with it.
> - About the timeout value in ppp.conf. I noticed that the system will
> logon to the ISP even when I do nothing to access any net
> addresses.
If this is the case, *something* is trying to send packets across the
interface. If you start Netscape (even on a blank page), it does
this. Also, if you are running routed (in /etc/sysconfig), that might
be causing this. If user-PPP is your only 'net connection, you
certainly should NOT be running routed. Disable it.
> While it is connected, I have yet to test the timeout value
> to see if it will disconnect after the certain period of time, or stay
> online indefinitely.
It does timeout properly for me. The first time I set up ppp, I
mistook this value to be in minutes. Got bounced off quite quickly.
> You can also try putting the ppp on-demand startup in a script file
A good place for this is in /etc/rc.local:
echo -n 'starting local daemons:'
# put your local stuff here
/usr/sbin/ppp -auto ondemand >/dev/null 2>&1 && echo -n ' ppp'
-jay