Snort Logging IP's but isn't Creating the Alert File

["Palula Brasil" <palula () uol com br>]

Hey everybody!

I've been using Snort as a single box IDS (HIDS). I found a new box and am preparing it to be a NIDS.

Anyway... Here is the line which I've been working with:
/usr/sbin/snort -D -A full -N -i eth0 -p -l /folder/subfolder/ -h x.x.x.x/x

-D to work as Daemon
-A full to generate full alerts
-N for it not o log folders with machine IP's (I just want the alerts)
-i eth0 to watch on my eth0 interface
-p for the interface to act non promiscuous
-l to log to this folder
-h to designate a home network

But this generates no alerts. I personally went to a security testing site and issued a portscan on my machine, beside 
doing a portscan from work and nothing has been alerted.

What am I doing wrong?

Thanks a lot!