1. DYNAMIC HOST
CONFIGURATON
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 renewal
2.Rebinding
3.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