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Durai presentation of dhcp



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  • 1. Dynamic Host Configuration Protocol(DHCP)
  • 2. Objectives
    • What is DHCP?
    • Describe the DHCP lease and renewal process
    • Install and authorize the DHCP service
    • Configure DHCP scopes
    • Create DHCP reservations for client computers
    • Configure DHCP options
    • Understand and describe the purpose of a DHCP relay
    • Install and configure a DHCP relay
  • 3. What is DHCP?
    • It stands for Dynamic Host Configuration Protocol
    • DHCP automatically assign the IP address to the computer
    • The ipconfig /all command will indicate whether the configuration came from a DHCP server computer
  • 4. How to assign IP address to a computer?
  • 5. Leasing an IP Address
    • An IP address is leased during the boot process
    • Default lease period is 8 days
    • Maximum lease period is 999 days
    • Leasing an IP address is performed by DORA process
  • 6. DORA Process
    • DORA process means
      • DHCP OFFER
      • DHCP ACK
  • 7. Simple network DHCP server discover DHCP server offer DHCP request DHCP acknowledge DHCP protocol is a mainly 4-step process: DHCP Server DHCP Clients Hello Mr. Server, I need to connect to the Internet, could you be kind to hook me up with an IP address? Ok dude, I got some in my pool of address, I lend you it. Check it out? Your IP : Thank you Mr. Server, I like your offer. I will use it. You’re welcome, here is your configuration but it’s only for 3 days. Router Internet DHCP Server UDP Port 68 UDP Port 68 UDP Port 68 UDP Port 67 DHCP Clients Broadcast Unicast
  • 8. Renewing an IP Address
    • The IP address can either be permanent or timed
    • A permanent address is never reused for another client
    • Timed leases expire after a certain amount of time
    • Windows clients attempt to renew their lease after 50% of the lease time has expired
    • A DHCP server may either honor or reject a renew request
  • 9. Renewing an IP Address (continued)
  • 10. Installation of DHCP
    • Install DHCP on Windows Server 2003
    • Make sure your network connection is statically configured
    • Install the service using the Add/Remove Windows Components utility
  • 11. Installing DHCP service
  • 12. Authorizing the DHCP Service
  • 13. Authorizing the DHCP Service
    • Unauthorized DHCP servers can hand out bad information
    • DHCP will not start unless authorized
    • If Active Directory is used, authorization takes place in Active Directory
    • DHCP servers are automatically authorized under certain conditions
  • 14. Creating a Scope
    • Create a scope to distribute IP addresses to client computers
    • Manually enter the IP configuration settings as directed by the text
    • Create a new scope using the configuration settings provided
  • 15. Configuring DHCP Scope
    • Scope is a range of IP address
    • Each scope is configured with:
      • Description
      • Starting IP address
      • Ending IP address
      • Subnet mask
      • Exclusions Range
      • Lease duration
  • 16. Configuring DHCP Scope
  • 17. Types of Scope
      • Super Scopes
      • Multicast Scopes
  • 18. Super scopes
    • It is a collection of individual scope
    • Combine two scopes into a single logical unit using a super scopes
    • First, create a second scope in addition to the scope already created in a previous activity
    • Create a super scopes to encompass the two scopes
    • Use the DHCP snap-in for this activity
  • 19. Super scopes
  • 20. Multicast scopes
    • It is used to deliver multicast address to a group of computers
    • It is defined by using the following parameters
        • Starting IP address
        • Ending IP address
        • TTL
        • Exclusions
        • Lease duration
  • 21. Creating DHCP Reservations
    • Reservations are used to hand out a specific IP address to a particular client
    • Reservations are created based on MAC addresses
  • 22. Configuring Relay agents
    • DHCP packets cannot travel across a router
    • A relay agent is necessary in order to have a single DHCP server handle all leases
    • Relay agents receive broadcast DHCP packets and forward them as unicast packets to a DHCP server
    • The DHCP relay cannot be installed on the same server as the DHCP service
  • 23. Example with Relay Agent Router Internet Relay agent Router 67 UDP Broadcast Source123.45.67.8 Destination : Client IP : DHCPOFFER Broadcast Source : Destination : DHCPDISCOVER Unicas t Source : Destination : 123.45.55. 3 Unicas t Source : Destination : 123.45.55. 3 DHCP Server Unicas t Source : Destination : 123.45.55. 3 Client IP: DHCPOFFER Unicas t Source : 123.45.53 Destination : 123.45.68 Client IP : New DHCP Client 68 UDP
  • 24. Advantage
      • It minimize the administrative burden
      • There is no chance to conflict IP address
      • It supports multiple scope like multicast scope and super scope
      • Disadvantage
        • The machine name does not change when you get a new IP address
        • When DHCP server is unavailable client unable to access the network