На всякий случай вот конфиг с которым у меня это хозяйство работает:

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[aabp@polygon ~]$ sudo cat /etc/ppp/options.pptp 
###############################################################################
# $Id: options.pptp,v 1.1 2005/02/18 01:40:23 quozl Exp $
#
# Sample PPTP PPP options file /etc/ppp/options.pptp
# Options used by PPP when a connection is made by a PPTP client.
# This file can be referred to by an /etc/ppp/peers file for the tunnel.
# Changes are effective on the next connection. See "man pppd".
#
# You are expected to change this file to suit your system. As
# packaged, it requires PPP 2.4.2 or later from http://ppp.samba.org/
# and the kernel MPPE module available from the CVS repository also on
# http://ppp.samba.org/, which is packaged for DKMS as kernel_ppp_mppe.
###############################################################################

# Lock the port
lock

# Authentication
# We don't need the tunnel server to authenticate itself
noauth

# We won't do EAP, CHAP, or MSCHAP, but we will accept MSCHAP-V2
refuse-eap
refuse-chap
refuse-mschap

# Compression
# Turn off compression protocols we know won't be used
nobsdcomp
nodeflate

# Encryption
# (There have been multiple versions of PPP with encryption support,
# choose with of the following sections you will use. Note that MPPE
# requires the use of MSCHAP-V2 during authentication)

# http://ppp.samba.org/ the PPP project version of PPP by Paul Mackarras
# ppp-2.4.2 or later with MPPE only, kernel module ppp_mppe.o
# {{{
# Require MPPE 128-bit encryption
require-mppe-128
# }}}

# http://polbox.com/h/hs001/ fork from PPP project by Jan Dubiec
# ppp-2.4.2 or later with MPPE and MPPC, kernel module ppp_mppe_mppc.o
# {{{
# Require MPPE 128-bit encryption
#mppe required,stateless
# }}}
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[aabp@polygon ~]$ sudo cat /etc/sysconfig/network-scripts/ifcfg-pptp0 
PEERDNS="yes"
DEVICE="pptp0"
ONBOOT="yes"
USERCTL="yes"
PERSIST="yes"
DEBUG="yes"
DEFROUTE="yes"
PPPOPTIONS=""
MRU=""
MTU=""
IDLETIMEOUT=""
VPN_HOST="vpn.lan"
VPN_USER="MY_LOGIN"

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[aabp@polygon ~]$ sudo cat /etc/ppp/chap-secrets 
# Secrets for authentication using CHAP
# client server secret IP addresses
MY_LOGIN vpn.lan MY_PASSWORD

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