Abstract: A method is presented for connectivity checking and detection of connectivity failure, based on a modified Ethernet ARP address resolution mechanism to detect broken connectivity on physical, data-link and network layer between a first and a second node. The detection mechanism uses Periodical Gratuitous ARP messages (PGARP). PGARP messages are sent by a first node, the sender host or Issuer. On the other side of a data path is a second node, receiver host or Listener configured to detect lost connectivity by means of missing PGARP messages. The process on the Listener then informs subscribing services, host local, or remote, about the state of the connectivity.