Security issues of Neighbor Discovery in IPv6: IPv6 nodes use the Neighbor Discovery Protocol to discover other nodes on the link, to establish the link-layer addresses to find routers, and to maintain reachability information about the paths to active neighbors. It turns out that the basic NDP lacks a method for determining approved neighbors. If not secured, NDP is vulnerable to various attacks like redirection, stealing addresses, rejection of service advertisement, and parameter spoofing could occur. IPv6 Neighbor Discovery issues: The functionality of the IPv6 Neighbor Discovery protocol corresponds to the combination of the IPv4 protocols. IPv6 has some new vulnerabilities because of the structure of its headers. The security of IPv4 is roughly equivalent to IPv6. So, the same issues occur in IPv4 equivalent protocols. Solution Security issues of Neighbor Discovery in IPv6: IPv6 nodes use the Neighbor Discovery Protocol to discover other nodes on the link, to establish the link-layer addresses to find routers, and to maintain reachability information about the paths to active neighbors. It turns out that the basic NDP lacks a method for determining approved neighbors. If not secured, NDP is vulnerable to various attacks like redirection, stealing addresses, rejection of service advertisement, and parameter spoofing could occur. IPv6 Neighbor Discovery issues: The functionality of the IPv6 Neighbor Discovery protocol corresponds to the combination of the IPv4 protocols. IPv6 has some new vulnerabilities because of the structure of its headers. The security of IPv4 is roughly equivalent to IPv6. So, the same issues occur in IPv4 equivalent protocols..