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Dynamic Host Configuration Protocol CSI 5321

Dynamic Host Configuration Protocol CSI 5321. Presented by Junaid Taqui. What is DHCP ?. Two Components of DHCP DHCP is built on a client-server model DHCP supports three modes of IP-Address allocation Automatic Manual Dynamic. Related Work.

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Dynamic Host Configuration Protocol CSI 5321

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  1. Dynamic Host Configuration ProtocolCSI 5321 Presented by Junaid Taqui

  2. What is DHCP ? • Two Components of DHCP • DHCP is built on a client-server model • DHCP supports three modes of IP-Address allocation Automatic Manual Dynamic

  3. Related Work • RARP • TFTP • ICMP • BOOTP NIP • ARP • RLP

  4. Definition of useful terms • DHCP client • DHCP server • BOOTP relay agent • Binding • Lease

  5. Format of DHCP message

  6. DHCP Messages • DHCPDISCOVER - Client broadcast to locate available servers. • DHCPOFFER - Server to client in response to DHCPDISCOVER with offer of configuration parameters.

  7. DHCP Messages • DHCPACK - Server to client with configuration parameters, including committed network address. • DHCPNAK - Server to client indicating client's notion of network address is incorrect (e.g., client has moved to new subnet) or client's lease as expired • DHCPDECLINE - Client to server indicating network address is already in use.

  8. DHCP Messages • DHCPRELEASE - Client to server relinquishing network address and canceling remaining lease. • DHCPINFORM - Client to server, asking only for local configuration parameters; client already has externally configured network address.

  9. The Client-Server Protocol • Client-server interaction - allocating a network address • Client-server interaction - reusing a previously allocated network address

  10. Allocating a network address SERVER CLIENT SERVER DHCPDISCOVER DHCPDISCOVER DHCPOFFER DHCPOFFER DHCPREQUEST DHCPREQUEST DHCPACK DHCPRELEASE

  11. Reusing a previously allocated network address SERVER CLIENT SERVER DHCPREQUEST DHCPREQUEST DHCPACK DHCPACK Initialization complete Subsequent DHCPACKS ignored

  12. References • Request for Comments:2132 – Dynamic Host Configuration Protocol • http://www.dhcp.org

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