Please Whitelist This Site? I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :) If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads. If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK. Thanks for your understanding! Sincerely, Charles Kozierok Author and Publisher, The TCP/IP Guide

NOTE: Using software to mass-download the site degrades the server and is prohibited. If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

1 The TCP/IP Guide: Introduction and "Guide To The Guide"

Welcome to the free online version of The TCP/IP Guide! My name is Charles and I am the author and publisher. I hope you will find the material here useful to you in your studies of computing, networking, and programming.

Here are a few tips, links and reminders to help you out:

• Introduction: Newcomers to The TCP/IP Guide may wish to read the Introduction and Guide to the Guide, which will explain what the Guide is about and provide you with useful information about how to use it.
  
  
• Navigation: For assistance understanding The TCP/IP Guide’s page structure and buttons, please refer to the Navigation Tips page.
  
  
• Getting Started on Content: Once you are ready to dive into the content, start at Networking Fundamentals if you are new to networking; if you know the basics of networks and the OSI Reference Model, feel free to jump straight to the TCP/IP Protocol Suite and Architecture section. Of course, remember you can use the Table Of Contents to start anywhere else you might wish!
  
  
• News: News about the free version of The TCP/IP Guide will be posted on the main TCP/IP Guide home page.
  
  
• Copyright and Disclaimer Reminder: Just a reminder that all of the material on this site is protected by copyright law and may not be reproduced without permission. Also, the material is provided on an as-is basis and I am not responsible for any loss that may result from your use of it. Please see this page for full details.
  
  
• Feedback / Contact Information: I welcome your feedback, comments and suggestions. You can reach me by clicking the “Contact Us” button on any page, which will take you to The TCP/IP Guide contact page.

Last but definitely not least: this site is provided as an online reference resource for casual use. Please do not use software to try to mass-download the pages of this site. The site contains over 1,500 pages, and doing this severely degrades server performance, making it difficult for others to use the site. For this reason, you risk having your access to the site blocked by an automatic script if you try to do this.

If you like The TCP/IP Guide enough to want your own copy in convenient PDF format, please license the full Guide. I would also appreciate it if those who are using the Guide extensively for commercial purposes would license it. And now, you can also get The TCP/IP Guide as a print book!

Thanks again and enjoy the site!

Charles

1 The TCP/IP Guide: Introduction and "Guide To The Guide"