IP Addresses: How to get one? How does an isP get block of addresses? From Regional Internet Registries (RIRs) ARIN (North America, Southern Africa), APNIC(Asia-Pacific RIPE(Europe, Northern Africa), LACNIC (South America How about a single host? Hard-coded by system admin in a file DHCP: Dynamic Host Configuration Protocol: dynamically get address: plug-and-play Host broadcasts "DHCP discover msg DHCP server responds with"DHCP offer"msg Host requests| P address:“ DHCP request”msg DHCP server sends address:“ DHCP ack”msg 9-26-06 Lecture 9: IP Packets 109-26-06 Lecture 9: IP Packets 10 IP Addresses: How to Get One? • How does an ISP get block of addresses? • From Regional Internet Registries (RIRs) • ARIN (North America, Southern Africa), APNIC (Asia-Pacific), RIPE (Europe, Northern Africa), LACNIC (South America) • How about a single host? • Hard-coded by system admin in a file • DHCP: Dynamic Host Configuration Protocol: dynamically get address: “plug-and-play” • Host broadcasts “DHCP discover” msg • DHCP server responds with “DHCP offer” msg • Host requests IP address: “DHCP request” msg • DHCP server sends address: “DHCP ack” msg