Many VPNs Leak Your DNS Through Chrome Extension

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Win 10: DNS resolution of remote network via VPN connection not working
The following is a list of the most common internal network name DNS resolution problems and solutions encountered in VPN gateway to gateway link environments: Google will then identify the VPN-over-DNS server farm as an authorized external application that is now allowed to access your mailbox. But not all systems do this. This often is the best deal between download speed and features. Exact same works for me. If you see a pop-up complaining about an authentication failure, like on fig. When we are outside the company and we establish VPN connection into the corporate network, we need to ask DNS server on the VPN interface, because otherwise the corporate resources are inaccessible.

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VPN vs DNS: Which one should you choose and why?

It is possible that when the VPN client is not configured to use the default gateway on the remote network that name resolution will fail for internal network resources. An unqualified DNS query is one where the query is for a computer name without the domain name. For example, the VPN client may wish to use the Web browser to access a Web server on the internal network. The user types in the URL http: If the resolver is unable to append a domain name, it will forward the unqualified request to the DNS server for resolution.

Unless the DNS server is configured with a WINS referral zone that can resolve these kinds of unqualified requests, the name resolution attempt will fail and so will the connection. The VPN clients should be configured with a primary domain name that it can append to unqualified requests.

There are several methods you can use to assigned a domain name to the VPN client: Many organizations use the same domain name for internal and external network resources.

For example, you may host a public DNS server named www. The server is accessible from the Internet by connecting to its public IP address. Internal network clients can also connect to the same server by using the same name, www.

When a VPN client tries to connect to www. The solution to this problem is to confirm that the VPN clients are assigned a DNS server address that can resolve internal network names. The following is a list of the most common internal network name DNS resolution problems and solutions encountered in VPN gateway to gateway link environments: Internet network hosts must be configured with a DNS server address that can resolve internal network names on both sides of the gateway to gateway VPN link.

If hosts on the opposite side of the VPN gateway to gateway link belong to a different domain, then you will need to configure the internal network clients to use a DNS server that can resolve names for all internal network domains. You can use stub zones or zone delegation to accomplish this task depending on the specifics of your internal network environment. Please refer to Support WebCast: Stub Zones and Conditional Forwarding for more information on Windows Server stub zone configuration.

Internal network hosts may be configured with an incorrect DNS server address. Check that the address was typed in correctly and that the DNS server is able to resolve names for all internal network domains. Internal network hosts may have been inadvertently been configured to use a DNS server that can only resolve Internet host names. The solution is to configure internal network clients with a DNS server address that can resolve both internal and external network names.

Not all internal network clients need to be assigned a DNS server address. The solution is to change the DNS server address on the clients to a DNS server that can resolve Internet host names or correct the configuration on the DNS server that should have been able to resolve the names. This is especially the case when internal network DNS servers host resource records for the internal network domains.

The internal network DNS server is located on an internal network domain controller. It is particularly important for a DNS server co-located on an internal domain controller to avoid direct contact with an Internet DNS server. Click Start and point to Administrative Tools. In the DNS Management console, click on your server name, then right click on the server name. Click on the Properties command figure 1. In the server Properties dialog box, click on the Interfaces tab figure 2.

The best way to accomplish this goal is to select the Only the following IP addresses option. View the list of IP addresses in the list and remove all addresses except for the primary IP address bound to the interface on this server. In this example all IP addresses have been removed except for the Use the Remove button to remove any IP addresses that you do not want on the list.

Click on the Forwarders tab figure 3. You can configure a DNS forwarder address on the Forwarders tab. Put a checkmark in the Do not use recursion for this domain. When you select this option, you place the entire responsibility for Internet DNS host name resolution on the forwarder.

If the forwarder cannot resolve the name, then the name resolution failure is communicated to the client system that issued the DNS query. If you allow recursion, then this DNS server will try to resolve the name itself after it receives the name resolution failure message from its forwarder. Its unlikely that that this internal DNS server will be able to resolve the name if the forwarder cannot and allowing this DNS server to perform recursion after the forwarder fails to do so can slow down the return of DNS name resolution failure messages to DNS clients on the internal network.

Click on the Advanced tab figure 4. Notice there is a Server options entry named Disable recursion also disables forwarders. This entry has quite a different meaning then the Do not use recursion for this domain option we saw in the figure above. Do not select the Disable recursion also disables forwarders option. If you select this option, then this DNS server could not resolve Internet DNS host names and could only return answers for domains that it was authoritative for.

The Disable recursion also disables forwarders option is a good option to select when you are publishing a public DNS server when configuring a split DNS infrastructure, but it is not a viable option when you want to use this DNS server to resolve Internet DNS host name. A split DNS infrastructure allows you to return different IP addresses to public and private network hosts for the same resources that are under your administrative control.

Click on the Root Hints tab figure 5. We recommend that you do not allow the internal network DNS server to perform recursion, so this list will not be used by this server to resolve Internet DNS host names. Click on the Monitoring tab figure 6. You should see a Pass entry in the Simple Query column. Remove the checkmark in the A simple query against this DNS server checkbox and then put a checkmark in the A recursive query to other DNS servers checkbox. Click the Test Now button.

You should see a Pass entry in the Recursive Query column. You expose your private DNS servers to potential attack from Internet intruders when internal network DNS servers are used to resolve both internal and external network names.

The most dangerous example is when the internal network DNS server is located on a domain controller. An optimal security configuration prevents external hosts from contacting any internal network domain controller and any DNS server authoritative for internal network DNS domains.

The caching-only DNS server is not authoritative for any zone on the internal or external network. The ISA Server component must also be able to resolve internal network names in order to located Active Directory domain controllers and other resources. The DNS stub zone contains only three resource records: Stub zones have a number of uses. Please refer to Windows Server Help for more information on stub zones. The caching-only DNS server can be configured to use a forwarder and perform recursion.

When you allow the caching-only DNS server configured to use a forwarder to perform recursion, the caching-only server will attempt to resolve the name itself if the forwarder is not successful in resolving an Internet DNS host name. However, you may consider this option if you do not trust the reliability of your forwarders. The DNS service can now be configured with one or more stub zones that allow it to forward DNS queries for internal network domains to the appropriate DNS servers on the internal network.

There are no internal network resource records contained in these stub zones that could potentially put your internal network at significant risk.

It is safe to include these stub zones on the caching-only DNS server. The first stub zone you create is the reverse lookup zone stub zone. In our current example, the internal network uses network ID Creating the Reverse Lookup Stub Zone. Click here to download it for free from the Google Play Android marketplace. The technology The main advantage of this type of tunnel is that it does not require a direct Internet connection ; you only need an access to a DNS resolver.

On the other hand, a major disadvantage is that this technology is often very slow, even over a high speed network. Another main disadvantage is that configuring the server is rather complicated. Our solution Our solution is extremely simple to install and use: Firstly, you do not need to configure the server, we have already done it for you.

Secondly, our software includes a simple mail user agent and a basic text-mode web browser. They are optimized for only two things: You will get a full-featured Internet experience, over a DNS tunnel.

The Value Pack is based exactly on the same code than the Android version, except for the specific native implementation of DNS transactions. Registered Android users get advanced features using the Perl version inbound and outbound mails queueing, free access to open proxies, Many Unixes are supported: It also runs on Docker and is available from Docker Hub for instant deployment.

Blind hacker's DNS tunneling approach Unix users only When you can access really nothing but dig or nslookup and a Perl runtime , not even root-level permission.

About VPN-over-DNS

So you want to find out whether to choose a VPN or a DNS for your home server? In this article, we will compare VPN vs DNS, or as some would say, VPN vs Smart DNS services. By the end of this article, you should know the differences between them, as well as the advantages of using one or the other. Select the Advanced tab. Uncheck the box for Only use ExpressVPN DNS servers while connected to the VPN, then click OK. For ExpressVPN and Click the three dots (), then click Options. Common DNS Issues in VPN Networking DNS issues comprise a major portion of connectivity problems related to ISA Server firewalls and VPN servers. ISA Server firewall/VPN servers and clients use DNS host name resolution to resolve both internal and external network names.