CSE 123 Lecture Notes - Lecture 12: Address Resolution Protocol, Regional Internet Registry, Dynamic Host Configuration Protocol

• School: UCSD
• Department: Computer Science and Engineering
• Course: CSE 123
• Professor: Alex Snoeren

Document Summary

Used by network adaptors to identify interesting frames. Used by humans to specify host of interest. First half: ouis: assigned to vendors by ieeee. 2nd half: adapters assigned by the vendor. Prefixes: icann, regional internet registries, and isps. Hosts: static config, or dynmaic using dhcp. Given an ip address,provide the mac addr. Given mac addr, assign unique ip addr. Given a host name, provide the ip addr (and vice versa) Consult the table when sending a packet. Sender caches result in its arp table. How do you and i get one? (ip) Host doesn"t have an ip address yet! So doesn"t know what source addr to use. Solution: shout to discover a server who can help. Install a special server on the lan to answer distress calls: host broadcasts dhcp discover , dhcp responds with dhcp offer, host requests ip addr: dhcp request , dhcp server sends addr: dhcp ack message w/ ip addr.