I can say that snort is working. I enabled the nmap xmas filter, and asked a friend to nmap my WAN ip address, and got him in the snort logs:
[ ** ] [ 1:1228:8 ] SCAN nmap XMAS [ ** ]
[ Classification: Attempted Information Leak ] [ Priority: 2 ]
04/02-23:40:19.256674 A.B.C.D:60949 -> A.B.C.D:237
TCP TTL:39 TOS:0x0 ID:10828 IpLen:20 DgmLen:40
**U*P**F Seq: 0x781204E9 Ack: 0x0 Win: 0x1000 TcpLen: 20 UrgPtr: 0x0
[ Xref =>
http://www.whitehats.com/info/IDS30 ]
I have snort running, not snort2c:
# ps aux | grep snort
root 64949 0.0 24.8 66776 30332 ?? Ss 10:00AM 1:58.47 snort -c /usr/local/etc/snort/snort.conf -l /var/log/
And in the status->services page, snort shows as up and running (lowmem mode). Still I wonder if I have updated the signatures or not, but well. It works.