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I have installed Snort IDS and most alarm is:

"COMMUNITY SIP TCP/IP message flooding directed to SIP proxy"

And i use home DSL Internet connection , should i be worried about this alarm ?

I have read this article but i couldn't understand it completely?

I set firewall on my router and I've block WAN to LAN connections, how these kind of packet pass it inside ?!!

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Is it possible that you are using an old snort version? Please see here: http://ubuntuforums.org/archive/index.php/t-1469108.html

Otherwise it would be great if you refine your question with some Firewallrules (Inbound) or some PCAP Files from wireshark.

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