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This is the BSDA Study Guide Book written via a wiki collaboration. This is a work in progress. You may contribute to or discuss this specific page at http://bsdwiki.reedmedia.net/wiki/Manipulate_ARP_and_neighbor_discovery_caches.html. Manipulate ARP and neighbor discovery caches Concept Understand basic ARP theory as well as the neighbor discovery cache used on IPv6 networks. Be able to view, modify and clear these caches and recognize when it is necessary to do so. Introduction arp: address resolution display and control ndp: control/diagnose IPv6 neighbor discovery protocol how arp works: machine1 asks broadcast "who has x.x.x.x?" broadcast request gets forwarded to all listeners machine2 answers broadcast request with "machine2 has x.x.x.x" view arp cache: arp -a ndp -a modify arp cache: arp -s hostname ether_addr (adds arp entry) arp -d hostname (deletes arp entry) ndp -s nodename ether_addr [temp] [proxy] ndp -d hostname clear arp cache: arp -d -a (combining -d[elete] with -a[ll] deletes all entries) ndp -c (erases all ndp entries) Examples Practice Exercises More information arp(8), ndp(8)