Why using FreeBSD6
Why use Freebsd6 to have CARP(traffic shapper) and all other this great stuff that come from "OPEN BSD"
Why simply not use open bsd for this project?
The mailing list had a discussion about it. you can read it here: http://pfsense.org/oschoice.txt
Because I have used freebsd for over 10 years. I am much more familiar with it.
And how about bothering looking for FAQ answers before asking ?