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  • No communication over PPTP VPN

    Hello all, I have a W2k server network using AD. There is a Cisco 1811 router connecting to the internet that port 1723 is open. Remote users can connect to my VPN, but there is no communication to the network. After logging on, I try to ping any address and I keep getting a Requst timed out. I have tried with DHCP Relay Agent set up in RRAS, and without. The strange part is, it worked just fine with the Linksys router I replaced. Cisco says everything is good on the router. What could I be missing?

  • #2
    Re: No communication over PPTP VPN

    Do you receive an ipadress?
    Can you ping it's gateway?
    Have you created an acl to allow traffic from the vpn subnet to internal?
    where is the vpn terminated?
    Marcel
    Technical Consultant
    Netherlands
    http://www.phetios.com
    http://blog.nessus.nl

    MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
    "No matter how secure, there is always the human factor."

    "Enjoy life today, tomorrow may never come."
    "If you're going through hell, keep going. ~Winston Churchill"

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    • #3
      Re: No communication over PPTP VPN

      Originally posted by d_weller View Post
      Hello all, I have a W2k server network using AD. There is a Cisco 1811 router connecting to the internet that port 1723 is open. Remote users can connect to my VPN, but there is no communication to the network. After logging on, I try to ping any address and I keep getting a Requst timed out. I have tried with DHCP Relay Agent set up in RRAS, and without. The strange part is, it worked just fine with the Linksys router I replaced. Cisco says everything is good on the router. What could I be missing?
      You need protocol 47 open (GRE) in addition to port 1723

      Comment


      • #4
        Re: No communication over PPTP VPN

        1) I get no IP address at all.
        2) I can not ping it's gateway.
        3) Nat was setup on the router to the internal server for authentication.
        4) The client VPNs are terminated at the server.

        I have used this VPN in this manner for years and have only had this problem since the Cisco router was implemented. I started there first and spent about 14 hours over three days with their engineers eliminating that possibility. Does Windows XP PPTP clients require a different port for communication? Something is being blocked and my guess it is at the router. But Cisco tells me no.

        Comment


        • #5
          Re: No communication over PPTP VPN

          You need to terminate the vpn on the router/firewall whatever which has a public address.
          Does the server has a public address?
          Marcel
          Technical Consultant
          Netherlands
          http://www.phetios.com
          http://blog.nessus.nl

          MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
          "No matter how secure, there is always the human factor."

          "Enjoy life today, tomorrow may never come."
          "If you're going through hell, keep going. ~Winston Churchill"

          Comment


          • #6
            Re: No communication over PPTP VPN

            Maybe I am misunderstanding the terminology. My clients connect to the public IP address and the W2k server authenticates. The router has a pblic IP, not the server. I am now calling Cisco noe to get protocol 47 open.

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