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Some DHCP servers also provide the legacy BOOTP functionality. When a network-connected computer boots up, its IP stack broadcasts BOOTP network messages requesting an IP address assignment. A BOOTP configuration server replies to the request by assigning an IP address from a pool of addresses, which is preconfigured by an administrator.
The client broadcasts the request and does not need prior knowledge of the network topology or the identities of servers capable of fulfilling its request. RARP has been rendered obsolete by the Bootstrap Protocol (BOOTP) and the modern Dynamic Host Configuration Protocol (DHCP), which both support a much greater feature set than RARP.
Server BOOTP DHCP DHCPv6 Other Load balancing Failover dhcpy6d No No Yes PXE, Dynamic DNS: Yes Yes dnsmasq Yes Yes Yes PXE, TFTP: No No ISC DHCP Yes Yes Yes Dynamic DNS [10] [11] ...
At boot time, a workstation that has been set to boot from PXE will issue a BOOTP request via the network. Once the request is received, the DHCP Server will supply an IP address to the machine, and the DNS server will point the client computer to the RIS server, which in turn will issue a disc boot image (often called the "OS Chooser").
The pioneering TFTP/BOOTP/DHCP approach fell short, as at the time, it did not define the required standardized client side of the provisioning environment. The Preboot Execution Environment (PXE) was introduced as part of the Wired for Management [ 2 ] framework by Intel and is described in the specification published by Intel and SystemSoft.
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BOOTP & DHCP Client EX Plus3 Three Parallel 10BASE2 and 10BASE-T TCP/IP, IPX/SPX, AppleTalk, and DLC/LLC Flash EEPROM DHCP Client (not BOOTP) 170x One Parallel (IEEE 1284.4) One 10BASE-T Ethernet TCP/IP, IPX/SPX, and DLC/LLC Non-upgradeable Discontinued: 175x One USB 1.0 One 10/100BASE-TX Ethernet TCP/IP, AppleTalk, LPD (Windows and Mac OS only)
The base DHCP does not include any mechanism for authentication. [31]: §7 Because of this, it is vulnerable to a variety of attacks. These attacks fall into three main categories: [8]: sec. 7 Unauthorized DHCP servers providing false information to clients. Unauthorized clients gaining access to resources.