Control Protocol(s)
● IPv4 Control Protocols:
ARP (for Ethernet)
ICMP
IGMP
● IPv6 Control Protocol:
ICMPv6
(IPv6 Next Header value = 58)
Must be fully implemented & supported!
ARP is Dead, Long Live Neighbour Discovery!
Much more than ARP (see Router Discovery
and redirects)
Reducing network load (multicast vs broadcast)
Improving robustness of packet delivery
Neighbor unreachability detection (incl. half-link
failures detection)
Notification from/to upper-layer!