IP addresses can be
Static IP address
Addresses that are manually assigned and do not
change over time
Dynamic IP address
Addresses that are automatically assigned for a
specific period of time and might change
What is DHCP?
It gives IP Addresses Automatically to the
Clients who is requesting for an IP Address
Centralized IP Address Management
DHCP prevents IP address Conflicts and helps conserve
the use of client IP Address on the Network
DHCP reduces the complexity and amount of
administrative work by assigning TCP/IP configuration
Client IP configuration is updated automatically
DHCP
Authorization
It is a Security Precaution that ensures that only
Authorized DHCP Servers can run in the Network. To
avoid computers running Illegal DHCP Servers in the
network
Scope
A scope is a range of IP addresses that are available to
be leased to clients
How DHCP Works
11 DHCP client broadcasts a DHCPDISCOVER packet
22 DHCP servers broadcast a DHCPOFFER paccket
33 DHCP client broadcasts a DHCPREQUEST packet
44 DHCP Server broadcasts a DHCPACK packet
DHCP
1
2
IP Addresses
IP addresses can be
Static IP address
Addresses that are manually assigned and do not
change over time
Dynamic IP address
Addresses that are automatically assigned for a
specific period of time and might change
3
What is DHCP?
It gives IP Addresses Automatically to the
Clients who is requesting for an IP Address
Centralized IP Address Management
DHCP prevents IP address Conflicts and helps conserve
the use of client IP Address on the Network
DHCP reduces the complexity and amount of
administrative work by assigning TCP/IP configuration
Client IP configuration is updated automatically
4
DHCP
Authorization
It is a Security Precaution that ensures that only
Authorized DHCP Servers can run in the Network. To
avoid computers running Illegal DHCP Servers in the
network
Scope
A scope is a range of IP addresses that are available to
be leased to clients
5
How DHCP Works
11 DHCP client broadcasts a DHCPDISCOVER packet
22 DHCP servers broadcast a DHCPOFFER paket
33 DHCP client broadcasts aa DHCPREQUEST packet
44 DHCP Server broadcasts a DHCPACK packet
DHCP
Client
DHCP
Server1
DHCP
Server2
6
What Is a DHCP Reservation?
1100..00..00..00
Workstation 11
DHCP ServerWorkstation 22
File Server
10.0.0.1: Leased to Workstation 1
10.0.0.2: Leased to Workstation 2
10.0.0.3: Reserved for File Server
A reservation is a specific IP address,
within a scope, that is permanently reserved to
a specific DHCP client
7
What Are DHCP Scope Options?
DHCP Client
DHCP Servver
DHCP Client IP Configuration Data
Clients IP address
Clients subnet mask
DHCP Scope options
DHCP Scope options are other server addresses
given to clients
8
How DHCP Server & Scope Options Are Applied
DHCP Server option applied
at the server level
DHCP at the Scope scope Scope A
10.0.0.0
Network
Scope B
11.0.0.0
Network
Windows XP
DHCP Server
Windows XP
Router
File Server
9
Lease Renewal Process
DHCP Client
DHCP
Server1
DHCP
Server2
11 DHCP client sends a DHCPREQUEST packet
22 DHCP Servre sennds a DHCPACK packet
50% of lease
duration has
of lease
87.5% 100% of lease
expired
If the client fails to renew its lease, after 50% of the lease
duration has expired, then the DHCP lease renewal process will
begin again after 87.5% of the lease duration has expired
its lease, after 87.5% of the lease has
expired, then the DHCP lease generation process starts over
again with a DHCP client broadcasting a DHCPDISCOVER
cclliieenntt 50% of lease
duration has
expired
1
2
IP Addresses
IP addresses can be
Static IP address
Addresses that are manually assigned and do not
change over time
Dynamic IP address
Addresses that are automatically assigned for a
specific period of time and might change
3
What is DHCP?
It gives IP Addresses Automatically to the
Clients who is requesting for an IP Address
Centralized IP Address Management
DHCP prevents IP address Conflicts and helps conserve
the use of client IP Address on the Network
DHCP reduces the complexity and amount of
administrative work by assigning TCP/IP configuration
Client IP configuration is updated automatically
4
DHCP
Authorization
It is a Security Precaution that ensures that only
Authorized DHCP Servers can run in the Network. To
avoid computers running Illegal DHCP Servers in the
network
Scope
A scope is a range of IP addresses that are available to
be leased to clients
5
How DHCP Works
11 DHCP client broadcasts a DHCCPDISCOVER packet
22 DHCP servers broadcaast a DHCPOFFER paccket
33 DHCP client broadccasts a DHCPREQUEST packet
44 DHCP Server Broadcasts a DHCPACK packket
DHCP
Client
DHCP
Server1
DHCP
Server2
6
What Is a DHCP Reservation?
1100..00..00..00
Workstation 1
DHCP Server Worksation 2
File Serrver
10.0.0.1: Leased to Workstation 1
10.0.0.2: Leased to Workstation 2
10.0.0.3: Reserved for File Server
A reservation is a specific IP address,
within a scope, that is permanently reserved to
a specific DHCP client
7
What Are DHCP Scope Options?
DHCP Client
DHCP Server
DHCP Client IP Configuration Data
Clients IP address
Clients subnet mask
DHCP Scope options
DHCP Scope options are other server addresses
given to clients
8
How DHCP Server & Scope Options Are Applied
DHCP Server option applied
at the server level
DHCP at the Scope scope Scope A
10.0.0.0
Network
Scope B
11.0.0.0
Network
Windows XP
DHCP Server
Windows 98
Windows XP
Router
Fille Server
9
Lease Renewal Process
DHCP Client
DHCP
Server1
DHCP
Server2
11DHCP Client sends a DHCPREQUEST packet
22 DHCP Server1 sends a DHCPACK packket
50% of lease
duration has
of lease
87.5% 100% of lease
expired
If the client fails to renew its lease, after 50% of the lease
duration has expired, then the DHCP lease renewal process will
begin again after 87.5% of the lease duration has expired
its lease, after 87.5% of the lease has
expired, then the DHCP lease generation process starts over
again with a DHCP client broadcasting a DHCPDISCOVER
cclliieenntt 50% of lease
duration has
expired
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