I recently setup a replacement for a Windows PPTP server.  Here's what
I did incase anyone else would like to do the same.

This is a Fedora Core 3 box.
I installed the following from www.poptop.org:
  dkms-2.0.5-1.noarch.rpm
  kernel_ppp_mppe-0.0.5-2dkms.noarch.rpm
  pptpd-1.2.3.tar.gz

Then I built and installed pppd from source from ppp.samba.org
(patched to use winbind):
  ppp-2.4.3.tar.gz

Next, I setup smb.conf:
[global]
  workgroup = mydomain
  realm = mydomain.com
  server string = myservername
  load printers = no
  log file = /var/log/samba/%m.log
  security = ads
  socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
  local master = no
  domain master = no
  preferred master = no
  wins server = 172.16.1.100
  dns proxy = no
  winbind uid = 10000-20000
  winbind gid = 10000-20000
  winbind use default domain = yes

Then join the computer to the domain:
  net join -U somedomainadmin

Edit /etc/pptpd.conf:
  option /etc/ppp/options.pptpd
  ppp /usr/local/sbin/pppd
  localip 172.16.4.50
  remoteip 172.16.100.100-150

Edit /etc/ppp/options.pptpd
  lock
  debug
  noauth
  name pptpdev
  nobsdcomp
  proxyarp
  refuse-pap
  refuse-mschap
  require-mschap-v2
  require-mppe-128
  ms-dns 172.16.1.100
  ms-dns 172.16.2.100
  defaultroute
  plugin winbind.so
  ntlm_auth-helper "/usr/bin/ntlm_auth --helper-protocol=ntlm-server-1"

Enable IP forwarding in /etc/sysctl.conf:
  net.ipv4.ip_forward = 1

Startup winbind:
  service winbind start

Startup pptpd:
  /usr/local/sbin/pptpd

Power down old Windows VPN server:
  Start -> Shutdown...
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