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When running Wireshark, filter down the capture to only your VPN traffic. If the VPN only has one IP address it could be connected to, filter by that IP. Then make sure you're capturing on the network interface supplying your data connection (Ethernet, WiFi) and not the VPN tunnel. Start your Capture, Connect the VPN then try to connect to something. Stop your capture once you feel you've demonstrated the problem.
Uploading a copy of the pcapng file somewhere and DMing it to one of us to look at will help out as well.
Some considerations with VPNs, especially PPTP VPNs. Make sure your VPN client, or computer, has the correct forwarding data in the computer's routing table. If forwarding rules are incorrect and tailored to your old router, that would cause a failure. A lot of PPTP VPNs require manual configuration. Second, make sure the gateway IP and subnet for your G3100 router network does not match that of the VPN, or you're not going to be able to route.
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Both port 1723 and GRE need to be forwarded, however that can’t be done at the Port Forwarding option. But a new protocol can be created, that includes both port 1723 and GRE. This can be done at the Port Forwarding Rules option under the Advanced section.
From the Home screen, click-on Advanced and Port Forwarding Rules
From the Port Forwarding Rules screen do the following:
Click-on Add.
Enter a name and description. I used VPN and PPTP (it doesn’t matter what you use)
Click-on Add server ports and select
Protocol: TCP
Source Ports: Any
Destination Ports: Single
Enter: 1723
Click-on Add
Click-on Add server ports again and select
Protocol: GRE
Click-on Add
Click-on Apply
We are done at the Port Forwarding Rules screen
From the Home screen, Click-on Firewall, and Port Forwarding
From the “Select IP from menu” drop-down, select IP address you want to forward to
From the “Application To Forward” drop-down, select VPN (or what ever name you used)
Click-on Add
Click-on Apply
We are done.
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Thank you BobAtVdm for sharing the configuration. Are you hosting a VPN server? I think these port forwarding rules are necessary when you are hosting VPN servers.
Does this work when you have multiple clients connecting to different sessions or different VPN servers?
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