[pptp-server] URGENT-- need help (Linux pptp server/win clients through the firewall)

[tmk]

URGENT-- need help (Linux pptp server/win clients through the firewall)make sure GRE packets are getting through both ways.. it doesnt look to me like they are.. that is the #1 cause of ppp connections failing if the initial pptp stuff works.

Kevin
  ----- Original Message ----- 
  From: Jandeep Kang 
  To: 'pptp-server at lists.schulte.org' 
  Sent: Friday, March 10, 2000 8:19 AM
  Subject: [pptp-server] URGENT-- need help (Linux pptp server/win clients through the firewall)


  Hi, 
  We have set up the Linux pptp server and have win 98/ NT clients. The server sits behind a firewall (also linux). I can connect to the Linux PPTP server using NT/98 from within the network but can't do it through the firewall. We have the tcp port 1723 redirected through the firewall to the PPTP server and are forwarding the GRE protocol using Ipfwd to the linux PPTP server. I can see the Ipfwd in action using the debug mode but I can't establish a connection. The excerpts from log on the linux box says the following:

  pppd[1208] : sent [LCP ConfReq id=0x1 <asyncmap 0x0> <auth chap 81> <magic 0xf2ab6569> <pcomp> <accomp>] 
  last message repeated 9 times 
  pppd[1208] : LCP: timeout sending Config-Requests 
  pppd[1208]: Connection terminated. 
  pppd[1208]: Exit. 
  pptpd[1207] : GRE: read(fd=4, buffer=804d7c0, len=8196) from PTY failed: status = -1 error = input/output error 
  pptpd[1207] : CTRL: PTY read or GRE write failed (pty,gre)=(4,5) 
  pptpd[1207] : CTRL: Client x.x.x.x control connection finished 

  the client is a win98 SE. 
  where is the problem? Is it a problem with PPP implementation on Linux box? I would really appreciate it if someone who has a similar configuration could shed some light on it. 

  Thanks a lot. 

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