Re: snort mixes multiple (unrelated) payloads into one alert

[Jason Brvenik <jasonb () sourcefire com>]

Eric J. Bowser wrote:
> Jason wrote:
> > The problem is packet loss. A single buffer is used for reassembly. If
> > you are missing packets when reassembly is done then the old data is
> > still in the gaps...
>
> So to make sure I have this right... mixed data happens when there is packet
> loss.  Turning on "zero_flushed_packets" will prevent the mixing, causing me
> to see all 0x00 instead.
>
> If running "zero_flushed_packets" has a performance hit associated, won't it
> increase incidence of dropped packets, and make the reassembly problem even
> worse?

yup. the proper solution is to appropriately size and tune the system to
handle the traffic. zero_flushed_packets really only solves the
erroneous event problems.

> Thanks for the info so far guys, keep it coming =)
>
> ~Eric
>
>
>
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