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.

The Book is Here... and Now On Sale!

Get The TCP/IP Guide for your own computer.
The TCP/IP Guide

Custom Search







Table Of Contents  The TCP/IP Guide
 9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)
      9  TCP/IP Internet Layer (OSI Network Layer) Protocols
           9  Internet Protocol (IP/IPv4, IPng/IPv6) and IP-Related Protocols (IP NAT, IPSec, Mobile IP)
                9  IP Security (IPSec) Protocols

Previous Topic/Section
IPSec Overview, History and Standards
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
IPSec Architectures and Implementation Methods
Next Topic/Section

IPSec General Operation, Components and Protocols
(Page 2 of 3)

IPSec Core Protocols

To support the activities above, a number of different components comprise the total package known as “IPSec”, as shown in Figure 116. The two main pieces are a pair of technologies sometimes called the core protocols of IPSec. These are the ones that actually do the work of encoding information to ensure security. They are:

  • IPSec Authentication Header (AH): This protocol provides authentication services for IPSec. What this means is that it allows the recipient of a message to verify that the supposed originator of a message was in fact the one that sent it. It also allows the recipient to verify that none of the data in the datagram has been changed by any intermediate devices en route. It also provides protection against so-called “replay” attacks, where a message is captured by an unauthorized user and re-sent.

  • Encapsulating Security Payload (ESP): The Authentication Header ensures integrity of the data in datagram, but not its privacy. When the information in a datagram is “for your eyes only”, it can be further protected using the ESP protocol, which encrypts the payload of the IP datagram.

    Figure 116: Overview of IPSec Protocols and Components

     



Previous Topic/Section
IPSec Overview, History and Standards
Previous Page
Pages in Current Topic/Section
1
2
3
Next Page
IPSec Architectures and Implementation Methods
Next Topic/Section

If you find The TCP/IP Guide useful, please consider making a small Paypal donation to help the site, using one of the buttons below. You can also donate a custom amount using the far right button (not less than $1 please, or PayPal gets most/all of your money!) In lieu of a larger donation, you may wish to consider purchasing a download license of The TCP/IP Guide. Thanks for your support!
Donate $2
Donate $5
Donate $10
Donate $20
Donate $30
Donate: $



Home - Table Of Contents - Contact Us

The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005

© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
Not responsible for any loss resulting from the use of this site.