Re: Help with content rules looking for the absence of a hex pattern (large ICMP modification)

[Erick Mechler <emechler () techometer net>]

:: Is there a typo or logic bug in my rule that isn't obvious?
:: 
:: icmp.rules:alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"ICMP Large 
:: ICMP Packet"; dsize: >800; content:!"|000000000000000000000000|"; depth:40; 
:: reference:arachnids,246; classtype:bad-unknown; sid:1000499; rev:3;)

No, there doesn't appear to be anything wrong with your signature.  Just 
wondering, did you try using a version of snort out of CVS to see if it 
fixes your problem?

Cheers - Erick


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