Skip to main content

Implementation of DHCP Protocol

Dynamic Host Configuration Protocol(DHCP) is an application layer protocol which is used to provide:
  1. Subnet Mask (Option 1 – e.g., 255.255.255.0)
  2. Router Address (Option 3 – e.g., 192.168.1.1)
  3. DNS Address (Option 6 – e.g., 8.8.8.8)
  4. Vendor Class Identifier (Option 43 – e.g., ‘unifi’ = 192.168.1.9 ##where unifi = controller)
DHCP is based on a client-server model and based on discovery, offer, request, and ACK.
DHCP port number for server is 67 and for the client is 68. It is a Client server protocol which uses UDP services. IP address is assigned from a pool of addresses. In DHCP, the client and the server exchange mainly 4 DHCP messages in order to make a connection, also called DORA process, but there are 8 DHCP messages in the process.
DHCP Packet Tracer Example Topology

Steps:
1) Create a network topology of a PC, a switch and a router.
2) The client is connected to Router-1, which acts like a DHCP server whose configuration         is discussed. When a client sens a DHCP request to the router then router sends any of       the available IPs to the router and assigns it.
3) Router Commands:
 Router>enable
 Router#config t
 Router(config)#int gig 0/1
 Router(config-if)# ip address 192.168.100.1    255.255.255.0
 Router(config-if)#no shut
 Router(config-if)#exit
 Router(config)#ip dhcp pool IP01
 Router(dhcp-config)#net 192.168.100.0 255.255.255.0
 Router(dhcp-config)# default 192.168.100.1
 Router(dhcp-config)#exit
 Router(config)#ip dhcp exc 192.168.100.1   192.168.100.15
 Router(config)#exit
 Router#
4) Then go to the PC and then click on DHCP icon in IP configuration.
5) Your PC will be issued an IP address with a message, "DHCP request successful"

Comments

Post a Comment

Popular posts from this blog

TCP and UDP Communications

Aim: To generate Network Traffic in simulation mode. Step 1: Generate traffic to populate Address Resolution Protocol (ARP) tables.        To reduce the traffic being viewed- Click MultiServer and click the Desktop tab> Command Prompt. Enter the ping 192.168.1.255 command. This will take a few seconds as every device on the network responds to MultiServer. Close the MultiServer window. Step 2: Generate web (HTTP) traffic.         Switch to simulation mode. Click HTTP client and click the Desktop tab> Web browser. In the URL field, enter 192.168.1.254 and click Go. Envelopes(PDUs) will appear in the simulation window. Minimize, but do not close, the HTTP Client Configuration Window. Step 3: Generate FTP traffic. Click FTP client and click the Desktop tab> Command prompt. Enter the ftp 192.168.1.254 command. PDUs will appear on the simulation window. Minimize, but do not close the FTP client Configuration Window...
Post a Comment
Read more

Socket Programming

SOCKET PROGRAMMING TCP Python provides two levels of access to network services. At a low level, you can access the basic socket support in the underlying operating system, which allows you to implement clients and servers for both connection-oriented and connectionless protocols. Python also has libraries that provide higher-level access to specific application-level network protocols, such as FTP, HTTP, and so on. What is Sockets? Sockets are the endpoints of a bidirectional communications channel. Sockets may communicate within a process, between processes on the same machine, or between processes on different continents. Sockets may be implemented over a number of different channel types: Unix domain sockets, TCP, UDP, and so on. The socket library provides specific classes for handling the common transports as well as a generic interface for handling the rest. Sockets have their own vocabulary − Term & Description 1 Domain  The family of pr...
Post a Comment
Read more

Star Topology using Hub & Switch

Star Topology Alternatively referred to as a  star network ,  star topology  is one of the most common network setups. In this configuration, every  node  connects to a central network device, like a hu b , switch , or computer. The central network device acts as a  server  and the peripheral devices act as  clients . Depending on the type of  network card  used in each computer of the star topology, a  coaxial cable  or an  RJ-45  network cable is used to connect computers together. Steps: 1) Create a network topology. 2) Assign IPs to the PCs. 3) Configure Router using CLI :-      Router>enter Router>enable Router(Config)#int gig 0/1 Router(Config)#ip address 192.168.1.1  255.255.255.0 Router(Config)#exit Router(Config)#line console 0 Router(Config-line)#password CISCO Router(Config-line)#login Router(Config-line)#exit Router(Config)#enable p...
Post a Comment
Read more