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| hscott63 2004-02-10, 2:30 am |
| Which is applied first AH or ESP in IPSec transport mode cause my Microsoft Press and Exam Cram 2 book gives conflicting information? MS Press says AH is applied first while Exam Cram mentions ESP and its kind of confusing.  | |
| jeff_j_black 2004-02-10, 4:37 pm |
| The ESP payload (encrypted data) is preceded by the AH header. Which is in turn preceded by the IP header. So the packet arrives, the AH header assures the recipient that the packet has not been tampered with, then the ESP payload is decrypted and the data is obtained. | |
| hscott63 2004-02-10, 9:39 pm |
| Thanks! Jeff, MS Press book was right from the start.  | |
| curiousgeorge 2004-02-12, 1:56 pm |
| AH stands for Authentication Header.
Just remember it this way: you have to authenticate with a computer before it will talk to you.
ESP encrypts the actual data packet. | |
| hscott63 2004-02-13, 6:50 pm |
| Thanks guys! Now I can move on to RRAA. |
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