Page 33 - Mobile Computing

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Transition States of DHCP with Neat Diagram

 DHCP is Dynamic Host Configuration Protocol for assigning IP
addresses to devices on a network, a device can have different IP address
every time it connects to the network.

 The DHCP has been devised to provide static and dynamic address
allocation.

 To provide dynamic address allocation, the DHCP client acts as a state
machine that performs transitions from one state to another depending on
the messages it receives or sends. Figure shows the transition diagram with
main states.

Boot

INIT

-/DHCPDISCOVER

SELECTING DHCPOFFER

Select Offer / DHCPREQUEST Lease time expired
or
REQUESTING DHCPNACK

DHCP ACK

Lease Cancelled
Lease time 50% expired DHCPRELEASE
DHCPREQUEST

BOUND

DHCP ACK DHCP ACK
RENEWING REBENDING

Lease time 87.5% expired /
DHCP REQUEST