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Comprehensive Guide to DHCP and TCP/IP Configuration: Second Edition

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paul-fleming
21 diapositives · 344 Views · Nov 06, 2014

This second edition guide explores the Dynamic Host Configuration Protocol (DHCP) as a critical aspect of TCP/IP networking. It covers how DHCP allows client computers to automatically request and receive IP addresses and essential configuration data, such as subnet masks, DNS server addresses, and more. The guide provides insights into client-server interactions, address leases, management of address pools, types of leases, and the standard address discovery process. With practical examples and a detailed explanation of DHCP elements, this resource is essential for network administrators and IT professionals.

#comprehensive guide to dhcp and tcp/ip configuration: second edition #comprehensive guide to dhcp and tcp/ip configuration: second edition ppt #powerpoint #presentation
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Comprehensive Guide to DHCP and TCP/IP Configuration: Second Edition
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  1. MIS 4700 Dynamic Host Configuration Protocol (DHCP) Part A Guide to TCP/IP, Second Edition

  2. Introducing DHCP • Provides a way for client computer to request an IP address • DHCP delivers the necessary configuration information • IP address • Subnet mask • IP Gateways • Address for DNS servers • Address for WINS servers Guide to TCP/IP, Second Edition

  3. Introducing DHCP (cont.) • Administer client IP address assignments and configuration data from a single, centralized server • Address pool or address scope • One or more range of IP address • Exclude an address or range of address • Address lease Guide to TCP/IP, Second Edition

  4. How DHCP Works • Client perspective on DHCP • Client is configured to “Obtain an IP address automatically” • At boot-up the client broadcasts DHCP address request • DHCP servers reply offers an address lease • Client accepts address lease offer • Server offers an IP address with a lease time limit • Half the lease time the client attempts to renew lease Guide to TCP/IP, Second Edition

  5. How DHCP Works (cont.) Guide to TCP/IP, Second Edition

  6. The Role Of Leases • Length of leases vary • One to three weeks in length are typical • One to three days for networks with temps or roving workers • Four to eight hours are common on ISP networks Guide to TCP/IP, Second Edition

  7. DHCP Software Elements • Three elements to DHCP software • DHCP client • Built-in DHCP client software in Windows and UNIX operating systems • DHCP Server • Manages address pools and related configuration of Windows and UNIX servers • DHCP relay agent • Intercepts address requests • Repackages requests and unicasts to a DHCP server Guide to TCP/IP, Second Edition

  8. DHCP Lease Types • Two types of address leases • Manual address lease • Dynamic address lease • Typical IP addressing schemes • Servers have fixed IP addresses • Routers have fixed IP addresses • Clients use dynamic IP Addresses Guide to TCP/IP, Second Edition

  9. More About DHCP Leases • IPCONFIG command supports the /release and /renew switches • How DHCP integrates with DSN • Server address are advertised using DNS • DNS is not a dynamic environment • Client address are resolved when using email addresses • User@domain.name Guide to TCP/IP, Second Edition

  10. Understanding IP Address Management With DHCP • Booting for the first time or after a lease expires • DHCP Discovery • Discovery broadcast • Renewal process • Rebinding process • Client must completely release its address if rebinding fails • Servers and clients use PING and ARP as error prevention methods Guide to TCP/IP, Second Edition

  11. The Standard Address Discovery Process • DHCP Discovery process uses four packets • DHCP Discover packet • DHCP Offer packet • DHCP Request packet • DHCP Acknowledgment packet Guide to TCP/IP, Second Edition

  12. The Standard Address Discovery Process (cont.) Guide to TCP/IP, Second Edition

  13. The Discover Packet • Client broadcasts a Discover Packet • Client hardware address • Source IP address 0.0.0.0 • Destination address 255.255.255.255 • Preferred address • Message Type value 1 • Client Identifier • DHCP options Guide to TCP/IP, Second Edition

  14. The Discover Packet (cont.) • DHCP options • Option 1: Client’s subnet mask • Option 3: Routers on the client’s subnet • Option 6: Domain name servers • Option 15: Domain name • Option 44: NetBIOS over TCP/IP name servers • Option 46: NetBIOS over TCP/IP node type • Option 47: NetBIOS over TCP/IP scope • Option 57: Maximum DHCP message size • Option 255: End of options Guide to TCP/IP, Second Edition

  15. The Discover Packet (cont.) Guide to TCP/IP, Second Edition

  16. The Offer Packet • DHCP server sends the Offer packet • An IP address is offered • Packet is sent by unicast Guide to TCP/IP, Second Edition

  17. The Offer Packet (cont.) Guide to TCP/IP, Second Edition

  18. The Request Packet • DHCP Request packet • DHCP Decline packet Guide to TCP/IP, Second Edition

  19. The Request Packet (cont.) Guide to TCP/IP, Second Edition

  20. The Acknowledgment Packet • Sent from Server • Contains configuration options requested by client • Duplicate IP address test Guide to TCP/IP, Second Edition

  21. The Acknowledgment Packet (cont.) Guide to TCP/IP, Second Edition