how to install poptop pptp server (beta)

reference : http://www.instructables.com/id/Setup-a-VPN-for-your-iPhoneiPad-or-Computer/

apt-get install ppp

apt-get install pptpd

vim /etc/pptpd.conf
################################################################################
#
# Sample PoPToP configuration file
#
# for PoPToP version 1.0.0
#
################################################################################

# TAG: speed
#
# Specifies the speed for the PPP daemon to talk at.
# Some PPP daemons will ignore this value.
#
speed 1152000000

# TAG: option
#
# Specifies the location of the PPP options file.
# By default PPP looks in '/etc/ppp/options'
#
#option /this/is/the/options/file
option /etc/ppp/options.ppp0

# TAG: debug
#
# Turns on (more) debugging to syslog.
#
debug

# TAG: localip
# TAG: remoteip
#
# Specifies the local and remote IP address ranges.
#
# You can specify single IP addresses seperated by commas or you can
# specify ranges, or both. For example:
#
#  192.168.0.234,192.168.0.245-249,192.168.0.254
#
# IMPORTANT RESTRICTIONS:
#
# 1. No spaces are permitted between commas or within addresses.
#
# 2. If you give more IP addresses than MAX_CONNECTIONS, it will
#    start at the beginning of the list and go until it gets 
#    MAX_CONNECTIONS IPs. Others will be ignored.
#
# 3. No shortcuts in ranges! ie. 234-8 does not mean 234 to 238,
#    you must type 234-238 if you mean this.
#
# 4. If you give a single localIP, that's ok - all local IPs will
#    be set to the given one. You MUST still give at least one remote
#    IP for each simultaneous client.
#
#localip 192.168.0.234-238,192.168.0.245
#remoteip 192.168.1.234-238,192.168.1.245

localip 192.168.0.1  # eth0 public ip address
#remoteip 192.168.1.100-199
remoteip 192.168.0.100  # eth1 public ip address will be given to remote

# TAG: ipxnets
#
# This gives the range of IPX networks to allocate to clients.  By
# default IPX network number allocation is not handled internally.
# By putting a low and high network number here a pool of IPX networks
# can be defined.  If this is done then there must be one IPX network
# per client.
#
# The format is a pair of hex numbers without any 0x prefix separated
# by a hyphen.
#
#ipxnets 00001000-00001FFF

# TAG: listen
#
# Defines the IP address of the local interface on which pptpd
# should listen for connections.  The default is to listen on all
# local interfaces (even ones brought up by pptp connections, thus
# permitting pptp tunnels inside the pptp tunnels).
#
#listen 192.168.0.1

# TAG: pidfile
#
# This defines the file name in which pptpd should store its process
# ID (or pid).  The default is /var/run/pptpd.pid.
#
pidfile /var/run/pptpd.pid
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vim /etc/ppp/options.ppp0
#
# Lock the port
#
lock

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

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

#
# We want MPPE
#
#require-mppe

#
# We want a sane mtu/mru
#
mtu 1000
mru 1000

#
# Time this thing out of it goes poof
#
lcp-echo-failure 10
lcp-echo-interval 10

proxyarp
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/etc/init.d/pptpd restart
OR
pptpd

configure the windows dialer as following :