Securely determining internet connectivity between networks

摘要

External network connectivity of an internal host can be measured by giving an external computer a payload identifying the internal host and instructions to deliver the payload to an external host. The external host may receive the payload and contact the internal host. The internal host's response and receipt of the payload may then determine the Internet connectivity of the internal host. The path from the computer through the trusted host to the internal server shows external network connectivity without exposing the internal host to the external network directly.