[ale] pptp and ppp continued

[Joe Steele]

I guess I wasn't making much sense, was I?  I admit to being 
less familiar with the mechanics of pptp than ppp.  But it 
appears that the pptp process is working properly, based on 
your tcpdump.  The ppp process is not.  And the sticking point 
is not in authentication with chap or encryption with mppe, 
because these issues are not tackled until after ppp negotiates 
lcp.  

Generally speaking, when the remote end of a ppp connection 
does not send any lcp packets (which is the first thing to be 
sent when ppp is initiated), it often means that it is waiting 
on some event (such as the receipt of a login name and password, 
or a string such as ppp or 'CLIENT') before it starts sending 
ppp packets.  It doesn't seem like this sort of thing should be 
necessary, but something is holding up the start of ppp on the 
remote end.

You *should* be able to feed the word 'CLIENT' to the server this 
way:

1)  create a chat script file called 'client.chat' with the 
following:

#wait 1 sec., then send it
''   \dCLIENT
#send it again for safe measure
''   \dCLIENT

2) run pptp(command wrapped on 2 lines):

pptp VPN_SERVER name gamyers remotename VP_SERVER connect 
'/usr/sbin/chat -v -f client.chat'

The -v should log the chat conversation, which may help with 
debugging.  Although sending 'CLIENT' may or may not help, it 
shouldn't hurt anything, and it shouldn't result in script 
failure errors.

One more (possibly important) thing -- Your log contained 
the following:

  Jan 15 15:37:18 a modprobe: modprobe: Can't locate module char-major-108

The README.linux file that comes with ppp makes reference to 
char-major-108, but it looks like it only applies to kernel 
versions >=2.3.13;  lessor kernels should not generate the 
error.  If this error is still occurring, it may be the root of 
your problem.

--Joe

-----Original Message-----
From:	Wandered Inn [SMTP:esoteric at denali.atlnet.com]
Sent:	Wednesday, January 17, 2001 8:36 PM
To:	'ALE'
Subject:	Re: [ale] pptp and ppp continued

Joe Steele wrote:
> 
> You say you can't get pptp to call a script.  But aren't you already
> using a chat script to control your modem, telling it to dial a number
> and so forth?  That's where they are saying the 'CLIENT' string should
> be put, as part of an expect/send pair.

Yeah, but the way it works is you have two ppp processes.  You first
connect to the internet via ppp0, you then fire up pptp which uses ppp
to create a second ppp process using ppp1.  So, when I dial up the
first, sending a client string at that time will do no good.  The syntax
for pptp is:

pptp VPN_SERVER name gamyers remotename VP_SERVER

Note, there's no need for a chat script.  I tried to stick one in there,
but all iterations fail and pptp exits pre-maturely.
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