January 2001
Intermediate to advanced
288 pages
7h 52m
English
Content preview from DHCP for Windows 2000Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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The BOOTP Conversation
Let’s explore the BOOTP conversation in more detail. There are two types of BOOTP messages, the BOOTPREQUEST and the BOOTPREPLY. The packet structure of these messages is identical; the only difference is in the type of information they contain.
Sending the BOOTPREQUEST
When the BOOTP client firsts boots up, it constructs a BOOTPREQUEST message and broadcasts this message across the network. This message includes information that allows the BOOTP server to determine what configuration data it must supply to the requesting host.
The BOOTPREQUEST message contains the following information:
- Source’s MAC address
From the client’s LAN adapter
- Destination’s MAC address
FF:FF:FF:FF:FF:FF (Ethernet broadcast)
- Destination’s IP address
255.255.255.255 (IP broadcast)
- Source’s IP address
0.0.0.0 (unless the requester knows its IP address)
- Destination server hostname
If requester prefers a specific server
- Boot filename
If requester prefers a specific boot file
- Vendor-specific data
Configuration data relating to operating system-specific functions.
Let’s take a moment to examine the contents of a BOOTPREQUEST message. In this example, I will work my way up the OSI Model starting with the Data Link Layer.
At the Data Link Layer, you find the Ethernet header, which contains hardware addressing, such as MAC addresses. The Ethernet header is also referred to as a frame. The Ethernet header’s destination address is an Ethernet broadcast, designated by the hexidecimal address FF:FF:FF:FF:FF:FF. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.