I am using a D-link Dir655 router. When I launch the VPN behind the router it does connect for usually less than 2 minutes. The Log says PPTP ALG rejected packet from the IP of the server I am connectin the VPN tunnel to. When I setup a Linksys router I have no problems. Am I making a setup error?
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This is a common problem with VPN and by no means confined to Verizon. You will need to check with whoever you are VPN connecting to as it is most likely they that are experiencing a problem and dropping your connection. Contact the host Network Admin or Support team to assist you. I have had this happen many times, especially when travelling and it has never been an issue with my laptop and has always been the host.
Buy 2 DIR 130 VPN routers and connect the two office networks via LAN-LAN VPN tunnels. If you have the time and skills you can build two IPCOP firewall routers and connect via VPN tunnels (http://sourceforge.net/apps/trac/ipcop/wiki)
- Logon to the configuration page of your D-Link. - Go to Advanced tab - And Click on Firewall Settings on the left side - Under that look for Application Gateway Level at the bottom and you must uncheck at the box on it and click on save settings at the top.
- Logon to the configuration page of the router - Go to Advanced tab - Select Firewall Settings at the left side - Uncheck the boxes under Application Gateway Level at the bottom part - And Click on Save Settings at the top.
You'll want to enable the VPN transparency. In the router's administrative web interface, click the Security Tab, then the VPN Passthrough sub-tab. Cisco VPN's usually use IPSEC, so enable the IPSEC Pass-through and click "Save Settings". If this doesn't work enable the PPTP Pass-through as well and give that a shot.
Nortel Contivity will work with the your D-Link router, however its functionality depends on the authentication type (AH will not work), NAT compatibilty mode, and disabling keep alives on the server. Contact your Network Administrator to find out how your VPN is configured.
Step 1 Verify that you are using the latest version of firmware on your router.
Step 2 Login to the Web Management for your router by entering its IP address (192.168.0.1) in your web browser. The default username is admin, and the password is blank.
Step 3 Click the Advanced Tab to access the Virtual Server Settings. There is a list of pre-defined Virtual Server Rules towards the bottom of the page. Find the IPSec Rule. Click the pen and paper icon to edit its settings. Enable the rule, enter the IP address of the computer attempting to connect to the VPN in the Private IP field, then Apply the changes.
Step 4 Create a new Virtual Server entry. Name the Virtual Server, "NortelVPN". Enter the IP address of the computer attempting to connect to the VPN in the Private IP field. For the Protocol Type, select Both. Enter 9550 for both the Public and Private Ports. Set the Schedule to always, then Apply the settings.
Step 5 Access the Tools Page, then click the Misc button. Disable IPSec Pass-through, then click Apply.
If the VPN Server is properly configured to work with clients behind NAT routers you should be able to connect to the VPN.