NDP-protokoll
RFC 4861. Hela protokollet som hanterar IPv6 link-layer-upptäckt: nästan-diskovery, router-discovery, parameter-discovery, redirect, address-resolution, NUD (neighbor unreachability detection).
5 ICMPv6-meddelandetyper: RS, RA, NS, NA, Redirect. Säkrare variant: SEND (Secure Neighbor Discovery, RFC 3971) använder kryptografiskt genererade adresser — knappt deployat. NDP-attacker: NA-spoofing (IPv6:s ARP-spoofing), RA-attacker (skicka fake RA ⇒ MITM). Skydd: RA Guard på switchar.