![]() If that request succeeds, it means that DNS was not able to resolve the "" name, so there is a DNS problem. To determine which, Tunnelblick sends a "GET" request using the IP address of the webserver that was returned by the pre-connection "GET" request. If there is no answer within 30 seconds, it is assumed that either DNS is not working or access to the Internet in general is impaired. If there is a response and the APIPA has not changed, the user is notified by a pop-up alert window. That web page returns a webpage that consists of three strings separated by commas: the APIPA, port to which the reply was directed, and the IP address of the webserver itself.įive seconds after a successful connection, Tunnelblick sends another identical "GET" request. Tunnelblick determines the APIPA by sending a "GET" request to " ". Tunnelblick detects the change by determining the computer's APIPA before connecting and comparing it with the APIPA five seconds after the connection succeeded. If the OpenVPN configuration file (and the options pushed to the computer by the OpenVPN server) do not include the "-redirect-gateway" option, Tunnelblick will supply the "-redirect-gateway def1" version of the option if you select the configuration and check the "Route all traffic through the VPN" checkbox on Tunnelblick's "VPN Details" window. That can be changed, to send all traffic through the VPN, by including a "-redirect-gateway" option in the OpenVPN configuration file, or by the OpenVPN server "pushing" the "-redirect-gateway" option to your computer. Normal traffic to websites, for example, is not sent through the VPN. By default, OpenVPN only sends traffic through the VPN that is destined for the VPN. If the computer's APIPA does not change, it may be due to an error or omission in the OpenVPN configuration. This feature can be enabled or disabled using a checkbox on the "Preferences" panel of Tunnelblick's "VPN Details" window. ![]() Some users want to use a VPN only for communication with a specific server or servers – such as an educational institution's library servers or an organization's intranet servers – and want all other Internet traffic to be sent normally, outside of the VPN. Tunnelblick can check that the computer's "apparent public IP address" (APIPA) changes after connecting to a VPN, which is what most users want to happen. The "apparent public IP address" is the address that is used on the (public) Internet as a computer's "return address". ![]()
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