[pptp-server] Authentication and Firewall Issues

[Ryan Matijcio]

Hello!

I am having some problems with PPTP.  First, I can't seem to find a
definition of the sequence of events in a PPTP session.  For example, the
client talks to the server over port x and the server responds over x to set
up a session on port y.  If anyone know how the interaction goes I'd
apprecaite knowing.

Secondly, I seem to be having an authentication issue and I can't seem to
figure out why.  Here's my log:

Mar  6 19:58:12 localhost pptpd[956]: CTRL: Client 206.172.224.166 control
connection started
Mar  6 19:58:13 localhost pptpd[956]: CTRL: Starting call (launching pppd,
opening GRE)
Mar  6 19:58:13 localhost modprobe: can't locate module char-major-108
Mar  6 19:58:14 localhost pppd[957]: pppd 2.3.10 started by root, uid 0
Mar  6 19:58:14 localhost pppd[957]: Using interface ppp1
Mar  6 19:58:14 localhost pppd[957]: Connect: ppp1 <--> /dev/pts/1
Mar  6 19:58:14 localhost pptpd[956]: GRE: Discarding duplicate packet
Mar  6 19:58:15 localhost pptpd[956]: CTRL: Ignored a SET LINK INFO packet
with real ACCMs!
Mar  6 19:58:15 localhost pppd[957]: No CHAP secret found for authenticating
RMatijcio
Mar  6 19:58:15 localhost pppd[957]: CHAP peer authentication failed for
remote host RMatijcio
Mar  6 19:58:16 localhost pptpd[956]: CTRL: Ignored a SET LINK INFO packet
with real ACCMs!
Mar  6 19:58:16 localhost pptpd[956]: CTRL: Error with select(), quitting
Mar  6 19:58:16 localhost pptpd[956]: CTRL: Client 206.172.224.166 control
connection finished
Mar  6 19:58:16 localhost pppd[957]: Modem hangup
Mar  6 19:58:16 localhost pppd[957]: Connection terminated.
Mar  6 19:58:16 localhost pppd[957]: Exit.

My /etc/ppp/options file:

lock
debug
#name fw-1
#auth
#require-chap
#proxyarp

I have the bottem 4 lines commented out because it was causing a problem
with my DSL connection.  I use pppd to drive a pppoe connection to my
service provider.  I did try taking these out and connecting to the PPTP
server directly (with both machines on the same subnet.)

Thanks!
Ryan P. Matijcio
Interworx Consulting Corporation
rpm at interworxconsulting.com