DHCP in Mobile computing

 

Mobile Computing

( DHCP )

 

What is DHCP ?

• Stand for Dynamic Host Configuration Protocol. 

• DHCP is a protocol that automatically assigns a unique IP address to each device that connects to a network. 

• There is no need to manually assign IP address to new devices. 

• It can be implemented on local networks as well as large enterprise networks.

If a new node ( system/device) is connected to the N/W, DHCP provides it with :- 

• DNS Server • Subnet Mask • Domain Name • IP Address

 ❖ DHCP client and server work together to handle the roaming status and to assign the IP address on a new N/W efficiently. 

❖ DHCP server allocates an IP address from pool of IP address to client. 

❖ Dynamically allots these address to nodes for a defined time, then they need to renew it.

 Close Up Photography of Yellow Green Red and Brown Plastic Cones on White Lined Surface

Importance of DHCP

 DHCP provides temporary IP addresses whenever a host moves from one N/W to another N/W. 

• Automatic → assigns a permanent to particular client. 

 • Dynamic → Assigns for specified period of time. 

• Manual → Assigned by N/W admin.

The DHCP lease process works as follows: 

DHCP works at the application layer to dynamically assign the IP address to the client and this happens through the exchange of a series of messages called DHCP transactions or DHCP conversation. 

•DHCP Discovery: The DHCP client broadcast messages to discover the DHCP servers. 

•DHCP Offer: When the DHCP server receives the DHCP Discover message then it suggests or offers an IP address(form IP address pool) to the client by sending a DHCP offer message to the client. 

•DHCP Request: In most cases, the client can receive multiple DHCP offer because in a network there are many DHCP servers. 

DHCP Acknowledgment: The server then sends Acknowledgment to the client confirming the DHCP lease to the client.

Components of DHCP 

• DHCP Server: It is a networked device implementing the DHCP services and influencing IP addresses and related configuration information. 

• DHCP client: DHCP client is the endpoint that receives configuration information from a DHCP server. 

• DHCP relay: A host or router that listens for client messages being broadcast on that network and then forwards them to a configured server. 

• IP address pool: IP address pool is the range of addresses that are available to DHCP clients. 

• Subnet: It tells the host that in which network it is currently present. 

• Lease: It is the amount of time for which the IP address is available to the client.When a lease expires, the client has to renew it.

 

Benefits of DHCP

• DHCP is easy to implement and does automatic assignment of IP addresses to requesting clients. 

• The implementation does not require any additional costs. 

• It has great benefit to mobile users as valid configuration parameters are automatically obtained from the new network. 

• Duplicate or invalid assignment of IP addresses are prevented. Hence there is no chance of conflicts in IP addresses.

 

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