Explain SPI of IPSec

AndreLAndreL Posts: 55Member ■■□□□□□□□□
When establishing an IPSec session it gives out (during the being of the Phase 1 and 2 (Main & Quick mode)) thats part of the SA (Security Association). The SPI, what is it and what does it do is it possible to make a comparison to something more well known like a similarity.

Also could any one lead me to a site that gives more simple description of IPSec, cause I'm having a heck of a time trying to understand it.

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