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PPTP VPN Problem - Cannot see LAN computers when connected

Discussion in 'DD-WRT Firmware' started by shasty22, Mar 8, 2006.

  1. shasty22

    shasty22 Network Guru Member

    Ok. Here is my dilemma. I have a WRT54G v4 loaded with V23 of DD-WRT. I have a Windows XP computer (192.168.1.101) accepting incoming VPN connections. I have the router configured to forward port 1723 to that computer, and I have the PPTP passthrough enabled.

    I am able to connect to and authenticate with the VPN server from outside the network without a problem, but for some reason I cannot ping the server itself or the other machines on my network.

    The VPN assigns the remote computer an IP of 192.168.1.112-115, so it should be able to ping the LAN addresses 192.168.1.100-105 but it cannot.

    I can connect to the router at 192.168.1.1 and go into the router configuration, but it just seems that I cannot get to anything past the router.

    I am probably missing some small bit of configuration here. I had the VPN working perfectly with the Linksys firmware and it just hasn't worked since I upgraded to DD-WRT.

    Please help!! Thanks!!
     
  2. jgutz20

    jgutz20 Network Guru Member

    is the IP address of the computer your connecting from also in this same subnet? could be a source for confusion
     
  3. shasty22

    shasty22 Network Guru Member

    The remote computers I have attempted to connect from are not on the same subnet. The remote computer is getting a PPP IP address for the VPN connection. This all worked with the Linksys firmware, that's why I feel like I'm missing something here. Plus, the remote computers which I am using now are the same ones I used when it worked successfully previously.

    Any suggestions?
     
  4. BigDog_UMG

    BigDog_UMG Network Guru Member

    You have to specifically tell Windows to allow VPN connections to access other computers.

    Go to 'Network connections', right click on 'Incoming Connections' and select 'Properties'.

    Hi light 'Internet Protocol (TCP/IP)' and press the 'Properties' button.

    Make sure the box 'Allow Callers To Access My Local Network' is checked.

    Hope that helps.
     
  5. sufrano63

    sufrano63 Network Guru Member

    ...I have a Windows XP computer (192.168.1.101) accepting incoming VPN connections. I have the router configured to forward port 1723 to that computer, and I have the PPTP passthrough enabled.

    Just curious.. :???: why not enable the PPTP server on the router allowing incoming PPTP client and free up a PC. Also no need to forward port 1723. As for not able to see other client on the same LAN. I have the same problem...well sort of. Chk out my other thread

    http://www.linksysinfo.org/modules.php?name=Forums&file=viewtopic&t=13774
     
  6. shasty22

    shasty22 Network Guru Member

    OK. I've set up the router as the PPTP server and the remote user is able to connect to it.

    New problem:

    Here's what the network looked like:

    Remote VPN client : 192.168.1.110/24 (address assigned by router)
    Local workstation: 192.168.1.100/24 (static)
    Local server: 192.168.1.101/24 (static)

    From the local workstation I was able to ping the remote VPN client. The VPN client could ping the local workstation but not the local server. Also, the VPN client was unable to establish a remote desktop connection or connection to a file share on the local workstation even though it was able to ping it. Another weird thing is that even after the VPN client disconnected, I was still able to ping the IP address. Is this just pinging the router?

    Any ideas on this??

    Thanks!
     
  7. BigDog_UMG

    BigDog_UMG Network Guru Member

    I'm able to connect to the router via VPN and establish a remote desktop session to a local workstation.

    Check the firewall on the local workstation (Windows Firewall, zoneAlarm, etc.) and make sure it is allowing port 3389 through.
     
  8. shasty22

    shasty22 Network Guru Member

    Remote desktop is already allowed through my windows firewall. I can confirm this because I can connect to the local workstation and local server from my wireless laptop.

    Any ideas why the remote VPN client could ping but not connect to the workstation and why the local server wasn't pingable?
     
  9. BigDog_UMG

    BigDog_UMG Network Guru Member

    I'm able to connect to the router via VPN and establish a remote desktop session to a local workstation.

    Check the firewall on the local workstation (Windows Firewall, zoneAlarm, etc.) and make sure it is allowing port 3389 through.
     

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