Abstract: A method of searching for a host in a network using IPv4 network comprises the steps of requesting host information, including link-layer address information and IP address information about an IP to be searched for, by sending a Neighbor Solicitation (NS) packet in which the IP to be searched for is set in an ICMPv6 target address to the network, after sending the NS packet, waiting for a predetermined time by taking a processing speed of a host and a transfer rate according to a network environment and state into consideration, after the predetermined time of waiting, determining whether a Neighbor Advertisement (NA) packet of the IP to be searched for has been received, and if, as a result of the determination, the NA packet of the IP to be searched for is determined to have been received, acquiring the host information from the NA packet.

Abstract: Disclosed herein are methods of searching for a host in a network using IPv4 and of blocking and searching a host in an IPv6 network which blocking access to an unauthorized network.

Abstract: Disclosed herein are methods of searching for a host in a network using IPv4 and of blocking and searching a host in an IPv6 network which blocking access to an unauthorized network.