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Microsoft Server 2008 R2. Dynamic Host Configuration Protocol. Dynamic Host Configuration Protocol. MAC Address IP Addressing DHCP Client DHCP Server Scope Exclusion Range Reservations Netsh. HISTORY OF DHCP. THE ROLE OF DHCP. Dynamically assigns TCP/IP addresses

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dynamic host configuration protocol
Dynamic Host Configuration Protocol
  • MAC Address
  • IP Addressing
  • DHCP Client
  • DHCP Server
  • Scope
  • Exclusion Range
  • Reservations
  • Netsh
the role of dhcp
THE ROLE OF DHCP
  • Dynamically assigns TCP/IP addresses
  • Dynamically assigns TCP/IP configuration information
  • Simplifies network administration
dynamic versus manual tcp ip address assignment

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IP addresses entered manually

IP addresses are supplied auto-

on each client computer

matically to client computers

Possibility of entering incorrect

Ensures that client always uses

or invalid IP address

correct configuration information

Incorrect configuration can

Client configuration updated

lead to communication

automatically to reflect network

and network issues

changes

Administrative overload on

Elimination of source of network

networks on which computers

problems

are frequently moved

DYNAMIC VERSUS MANUAL TCP/IP ADDRESS ASSIGNMENT
ethernet address and ip address
Ethernet Address and IP address
  • Each machine has an Ethernet address and IP address
    • Ethernet is a unique 48 bit address
      • Also known as MAC (media access control) addresses
ethernet address and ip address7
Ethernet Address and IP Address
  • Can also view the MAC address by typing:
    • C:\>ipconfig /all
    • Start->run->msinfo32 <enter>
ip addressing rules and concepts
IP Addressing Rules and Concepts
  • Addresses you cannot assign
    • Default route address: 0.0.0.0
    • Loopback address: 127.0.0.1
    • Network number: 172.17.13.0
    • IP Broadcast address: 172.17.13.255
dynamic host configuration protocol9
Dynamic Host Configuration Protocol
  • Used for manageability and automation of IP address assignment on networks.
    • Ie. ISP’s use DHCP when you establish connection.
scopes and superscopes
Scopes and Superscopes
  • When configuring DHCP, the first step is to create a range of addresses that will be managed. This is called a scope.
  • A single DHCP server can service more than one subnet by assigning a scope to each subnet.
  • You can create a superscope to service more than on range of IP’s on the same segment.
dhcp message types

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DHCPDISCOVER

Used by clients to request configuration parameters

from a DHCP server

DHCPOFFER

Used by servers to offer IP addresses to requesting

clients

DHCPREQUEST

Used by clients to accept or renew IP address

assignment and to decline unaccepted servers

DHCPDECLINE

Used by clients to reject an offered IP address

DHCPACK

Used by servers to acknowledge a client’s

acceptance of an offered IP address

DHCPNACK

Used by servers to reject a client’s acceptance of an

offered IP address

DHCPRELEASE

Used by clients to terminate an IP address lease

DHCPINFORM

Used by clients to obtain additional TCP/IP addresses

DHCP MESSAGE TYPES
leases client options exclusions and reservations
Leases, client options exclusions and reservations
  • A lease determines how long the client will maintain the same IP address before it is issued a new lease of another IP address
  • Client options are configured during the setup or after. They can range from simply setting the default gateway, DNS and WINS servers to Network Time Servers and NetBios Settings
  • Exclusions are IP Addresses within the scope that you do not want assigned dynamically. For instance you may statically assign your server’s IP address and do not want that assigned to another machine. What would happen if it did assign it’s own IP address?
    • A single exclusion can be created or a range of exclusions
  • Reservations ensure that the same MAC gets the same ip address every time. Reservations are created within the scope.
what are dhcp client reservations
WHAT ARE DHCP CLIENT RESERVATIONS?

Client reservations permanently reserve a specific address for a specific client.