Nmap Scan Not Detected

[John Redrichs <port53udp () yahoo com>]

I'm running snort 2.1.1 with the latest rules and I
have scan.rules turned on in my snort.conf.  I told
snort to snort on -i eth1 (snort -dev -l
/var/log/snort/logs/ -h 1.2.3.4/32 -c
/etc/snort/snort.conf -i eth1
) which is my external interface on my home net.  Then
I ran "nmap -O 1.2.3.4" as root from an IP sitting on
the Internet (1.2.3.4 is my home net's external IP).

I was expecting a log file to tell me a fingerprint
scan was initiated against me, but there was none...

What did I do wrong?  Thanks!

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