-------- Original Message --------
> So, could someone explain what are Phase 1 and Phase 2 lifetime exactly
I answer to myself ;-) hoping this could be useful to someone else...
I've found a very interesting article on IPsec on the ONLamp.com
(O'Reilly) web site, written by Dru Lavigne.
The URL is: http://www.onlamp.com/lpt/a/3009
In particular, read the last paragraph: "Phase One and Phase Two".