Why does connecting to my work VPN cause my internet to not work?

All we need is an easy explanation of the problem, so here it is.

I VPN to my work, and then I terminal server into my computer.

Everything works fine in relation to the VPN access, but locally I can’t access the internet.

How can I fix this?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

What you are looking to do is called split tunneling. If you are using a Microsoft PPTP VPN, you need to uncheck “Use default gateway on remote network” in the TCP/IPv4 advanced settings for the VPN connection.

If you are using another VPN client, you need to look for something related to split tunneling in the VPN client’s documentations. Please note that some VPN’s allow the administrator to disable split tunneling.

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Method 2

I’ve been dealing with this for a whole day and finally found the resolution. Here is how:

  1. First issue: I couldn’t connect to internet after I established my
    VPN .
  2. Resolution: I have disabled/unchecked “Use default gateway”
    checkbox on TCP IPv4 properties (VPN Connection Settings => Network
    => Internet protocol (TCP/IPv4) => properties => Advanced => Use default gateway on remote network)
  3. Second issue: after that
    although my internet was working perfectly I could not connect to
    resource I need on that remote network (reason for VPN in first
    place 🙂
  4. Resolution: manually add route to routing table. This is
    how:
  5. a: First check what IP is assigned to you when you connect to
    VPN (mine was 10.30.0.12 so default gateway should be 10.30.0.1) and
    the resource that you need to access via VPN with subnet mask (mine
    was 172.18.0.19 255.255.255.255)
  6. b: after that you have all needed
    information to set up route manually (as described here
    http://support.microsoft.com/kb/317025). Mine manual route was (just
    enter it in command prompt):

    route -p add 172.18.0.19 mask 255.255.255.255 10.30.0.1
    

and that’s it. Hope it helps!

Method 3

If the computer has connectivity to both the internet and the corporate VPN at the same time, and the computer is compromised in some way, or deliberately configured to bypass security, the computer can act as an unauthorized bridge between the public internet and corporate LAN.

The default behavior of almost all VPN software is therefore to isolate you from the public internet through routing, firewalling, layered service providers (windows only), and other technologies. Whether this can be changed or not depends on the product in question – some of them go to great lengths to make sure that someone doesn’t find a creative solution to reenable internet access while the VPN is running.

The best workaround I’ve found if you have to connect to a VPN frequently is to have a virtual machine dedicated to VPN access – this method won’t be blocked by VPN software, and it still keeps reasonably good separation between the internet and the corporate network.

Method 4

Once you connect to the VPN, all the requests go through the VPN . You could delete the routes for particular sets of IPs (say your home router) using the route command which is usually not suggested because of security issues (this is the case usually, not Windows 7 though)

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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