1. Wednesday, December 04, 20021 Dynamic Host Configuration Protocol CSI 5321 Presented by Junaid Taqui

2. Wednesday, December 04, 20022 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. Wednesday, December 04, 20023 Related Work  RARP  TFTP  ICMP  BOOTP NIP  ARP  RLP

4. Wednesday, December 04, 20024 Definition of useful terms  DHCP client  DHCP server  BOOTP relay agent  Binding  Lease

5. Wednesday, December 04, 20025 op (1) htype (1)hlen (1)hops (1) xid (4) secs (2)flags (2) ciaddr (4) yiaddr (4) siaddr (4) giaddr (4) chaddr (16) sname (64) file (128) options (312) Format of DHCP message

6. Wednesday, December 04, 20026 DHCP Messages  DHCPDISCOVER - Client broadcast to locate available servers.  DHCPOFFER - Server to client in response to DHCPDISCOVER with offer of configuration parameters.

7. Wednesday, December 04, 20027 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. Wednesday, December 04, 20028 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. Wednesday, December 04, 20029 The Client-Server Protocol  Client-server interaction - allocating a network address  Client-server interaction - reusing a previously allocated network address

10. Wednesday, December 04, 200210 Allocating a network address SERVER CLIENT SERVER DHCPDISCOVER DHCPOFFER DHCPREQUEST DHCPACK DHCPRELEASE

11. Wednesday, December 04, 200211 Reusing a previously allocated network address SERVER CLIENT SERVER DHCPREQUEST DHCPACK Initialization complete Subsequent DHCPACKS ignored

12. Wednesday, December 04, 200212 References  Request for Comments:2132 – Dynamic Host Configuration Protocol  http://www.dhcp.org http://www.dhcp.org