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  • 1. DYNAMIC HOSTCONFIGURATON PROTOCOL (DHCP) BY SIMSON JOSEPH ROLL NO. 30
  • 2. INTRODUCTION The DHCP is a network configuration protocol for hosts on internet protocol networks. DHCP eliminates the manual task by a network. DHCP is used for IPV4 as well as IPV6. Alternatively,IPV4 hosts may use stateless address autoconfiguration.IPV4 hosts may use link-local addressing to achieve limited local connectivity.
  • 3.  HISTORY DHCP was first defined as a standards track protocol in RFC 1531 in October 1993,as an extension to the BOOTP. Many worked to clarify the protocol as it gained popularity, and in 1997 RFC 2131 was released, and remains as of 2011 the standard for IPV4 networks. DHCPv6 was further extended to provide configuration information to clients configured using stateless address autoconfiguration in RFC 3736.
  • 4. What is RFC? Stands for request for comments When standards are proposed ,they are made available for public comment so that they can be refined and agreed upon. The document which details the proposed standards is called a ”request for comments ” document.
  • 5.  TECHNICAL OVERVIEW DHCP automates network –parameter assignment to network devices from one or more DHCP servers. The DHCP server manages a pool of IP address and information about client configuration parameters such as default gateway , domain name , the name servers ,other servers such as time servers. Depending on implementation , the DHCP server may have three methods of allocating IP- address.
  • 6. METHODS DYNAMIC ALLOCATION AUTOMATIC ALLOCATION STATIC ALLOCATION
  • 7. DYNAMIC ALLOCATION A network administrator assigns a range of IP addresses to DHCP , and each client computer on the LAN is configured to request an IP address from the DHCP server during network initialization. The request and grant process uses a lease concept with a controllable time period.
  • 8. AUTOMATIC ALLOCATION The DHCP server permanently assigns a free IP address to a requesting client from the range defined by the administrator.
  • 9. MANUAL ALLOCATION Server allocates an IP address based on a table with MAC address/IP address pairs , which are manually filled in by a network administrator. The DHCP is used simply to convey the assigned address to the host.
  • 10. RELIABILITYIt provides reliability in several ways :1.Periodic renewal2.Rebinding3.Failover
  • 11. DISTINGUISHED BOOTP and DHCP 1.Design 2.Capabilities 3.Expiration 4.Client support 5.Phase 6.Rebind or renew
  • 12. SECURITY The base DHCP protocol does not include any mechanism for authentication. Because of this , it is vulnerable to a variety of attacks. Unauthorized DHCP servers Unauthorized client Attacks
  • 13. CONCLUSION DHCP is a network protocol that enables a server to automatically assign an IP address to a computer from a defined range of numbers configured for a given network. DHCP assigns an IP address when a system is started.
  • 14. THANK YOU