[Snort-users] BPF problem

Mike Patterson mike.patterson at ...16895...
Fri Jul 11 13:55:43 EDT 2014


On Jul 11, 2014, at 1:49 PM, waldo kitty <wkitty42 at ...14940...> wrote:

> On 7/11/2014 1:34 PM, Mike Patterson wrote:
>> Following up to myself: I’ve tried various permutations of my BPF filter to
>> no avail. I tried Snort versions 2.9.5.3 (which is what’s on my old sensor),
>> 2.9.6.0, and 2.9.6.1. Always, Snort says it’s reading my BPF filter, and
>> always, it’s including alerts for IPs and networks that are in the filter.
>> 
>> My current filter is of the form:
>> 
>> not (net 1.2.3.4/8 or not net 10.0.0.0/24 or not 172.16.12.1)
> 
> this may not be related to your problem but i can't help seeing the double 
> negatives in the above... are you wanting to include or exclude traffic to/from 
> 10.0.0.0/24 and 172.16.12.1?
> 
> if you want to exclude traffic from them, perhaps you mean to use
> 
> not (net 1.2.3.4/8 or net 10.0.0.0/24 or 172.16.12.1)

That’s actually what I’m using, I just can’t transcribe properly.

Mike





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