Firewall stopping detection?

[David Findlay <david_j_findlay () yahoo com au>]

I have just install snort from Debian Unstable, and customised the config 
file to suit my system. I then went to grc.com and used the probe my ports 
thing, to see if snort would detect it, but I get nothing in the logs. I have 
a firewall using ipchains, which blocks all connections except for stuff 
iniated from inside. How do i get snort to still detect attack attempts 
coming in? Thanks,

David

P.S. Please CC me your reply as I am not a subscriber to the list. Thanks :-)

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