Lecture10 - Dynamic Address Allocation

Lecture10 - Dynamic Address Allocation - 11/9/2009 Dynamic...

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Unformatted text preview: 11/9/2009 Dynamic Address Allocation CNIT 240 – Data Communications & Networks Host Requirements To communicate on an internetwork, a host needs local knowledge of: Layer 2 address (MAC address) Layer 3 address (IP Address) Since the MAC address is hard coded, we don’t need to discover it. We can manually specify an IP address, but… Network addresses can change over time Hosts are changed over time Not all hosts are continuously connected to the network … 1 11/9/2009 Dynamical Addressing RARP – Reverse ARP BootP – Bootstrap Protocol DHCP – Dynamic Host Configuration Protocol RFC 1531 in 1993 RFC 1541 in 1993 RFC 2131 in 1997 DHCP “A framework for passing configuration information to hosts on a TCP/IP network.” Extends BootP functionality Client/Server Architecture Adds the capability additional configuration options 2 11/9/2009 DHCP Message Format DHCP Leases Lease Process Reservations Early Termination TYPE FIELD 1 2 3 4 5 6 7 8 DHCP MESSAGE Type DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPDECLINE DHCPACK DHCPNACK DHCPRELEASE DHCPINFORM 3 11/9/2009 DHCP Operations Scope:___________________ Addr avail? Time X N 18:45 DHCP Operations Scope:___________________ Addr avail? Time X N 18:45 4 11/9/2009 DHCP Options The OPTIONS field was specifically intended to allow vendors to enhance and extend functionality Proprietary features Subnet Mask Time Server Name Server Print Server Hostname MTU Routing Table Entries Bootfile name … Questions? 5 ...
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Lecture10 - Dynamic Address Allocation - 11/9/2009 Dynamic...

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