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Dynamic Host Configuration Protocol (DHCP). John Kristoff jtk@depaul.edu +1 312 362-5878 DePaul University Chicago, IL 60604. Overview. Bootstrapping diskless workstations RARP BOOTP ICMP Information Request DHCP. Bootstrapping and configuration.

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Dynamic host configuration protocol dhcp l.jpg
Dynamic Host Configuration Protocol (DHCP)

  • John Kristoff

  • jtk@depaul.edu

  • +1 312 362-5878

  • DePaul University

  • Chicago, IL 60604


Overview l.jpg
Overview

  • Bootstrapping diskless workstations

  • RARP

  • BOOTP

  • ICMP Information Request

  • DHCP


Bootstrapping and configuration l.jpg
Bootstrapping and configuration

  • Host loads boot image and/or config from net

  • Station needs to know its own IP address

  • Station only knows its hardware address/info

  • Station needs, minimally:

    • IP address

    • A default router

    • Subnet mask

    • And a DNS server or two would be nice


Old methods l.jpg
Old methods

  • RARP

    • What is IP for h/w address xx-xx-xx-xx-xx-xx

  • ICMP info/mask/router queries

    • What is my IP, subnet, default router, etc.

  • BOOTP

    • What is my IP config (and maybe loader file)


Enter dhcp l.jpg
Enter DHCP

  • BOOTP + leased IPs and other parametersf


Typical discovery process l.jpg

Server

DHCPOFFER

DHCPACK

Typical discovery process

Client

  • DHCPDISCOVER

  • DHCPREQUEST

  • DHCPRELEASE


Notes l.jpg
Notes

  • Leases

  • DHCP parameters

  • UDP protocol ports 67 and 68

  • DHCP versus BOOTP versus RARP

  • Security/authentication issues