Initialization (BOOTP and DHCP)

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Page 1. Raj Jain The Ohio State University 32-1 Chapter 32 Initialization (BOOTP and DHCP) Raj Jain The Ohio State University Columbus, OH 43210 Jain@CIS.Ohio-State.Edu http://www.cis.ohio-state.edu/~jain/ Page 2. Raj Jain The Ohio State University
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  Raj Jain The Ohio State University 32-1 Chapter 32Chapter 32Chapter 32InitializationInitializationInitialization(BOOTP and DHCP)(BOOTP and DHCP)(BOOTP and DHCP) Raj JainThe Ohio State UniversityColumbus, OH 43210Jain@CIS.Ohio-State.Eduhttp://www.cis.ohio-state.edu/~jain/   Raj Jain The Ohio State University 32-2 q Bootstrapping (Diskless workstations) q BOOTP q Dynamic address allocation q DHCP Overview  Raj Jain The Ohio State University 32-3 BootstrappingBootstrappingBootstrapping q Computer loads a simple boot program. The bootprogram loads operating system. q On diskless machine, the computer needs to know thenetwork address of the o/s file q It needs to know its own IP address. q It only knows its h/w address.  Raj Jain The Ohio State University 32-4 ConfigurationConfigurationConfiguration q Protocols are software routines. q All nodes have the same software. q Different nodes have different parameters: Addresses,packet size, etc. q Configuration = Setting the parameters q IP Address q Default router address q Subnet mask  q DNS server addresses  Raj Jain The Ohio State University 32-5 Method 1: Long PastMethod 1: Long PastMethod 1: Long Past q Reverse ARP: "What is the IP address of h/w addressxx:xx:...?" q But RARP uses IP ⇒ Needs IP address. q Solution: Use 00.00.00.00 as source address. q ICMP: What is my subnet mask? q ICMP: What is my default router? q Problem: What is the boot file name for IP addressnn.nn.nn...?
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