The time required to detect movement between networks and to obtain (or to continue to use) an IPv4 configuration may be significant as a fraction of the total handover latency in moving between points of attachment. This document synthesizes@ from experience in the deployment of hosts supporting ARP@ DHCP@ and IPv4 Link-Local addresses@ a set of steps known as Detecting Network Attachment for IPv4 (DNAv4)@ in order to decrease the handover latency in moving between points of attachment.