[Snort-users] BPF problem

James Lay jlay at ...13475...
Fri Jul 11 14:00:04 EDT 2014


On 2014-07-11 11:55, Mike Patterson wrote:
> 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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Give:

not (net 1.2.3.4/8 or net 10.0.0.0/16 or 172.16.12.1)

a go

James




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