[Zeek-Dev] connection $history - 'g' for gap

Jim Mellander jmellander at lbl.gov
Tue Apr 9 09:53:57 PDT 2019

Thanks.  I was thinking of something a bit different - the total amount of
the content gap is useful, but in some cases it might be useful to know
where the content gaps occurred, whether in the head of the connection,
which likely is impactful for protocol analysis, or in a long tail, where
it probably doesn't affect analysis.

Perhaps some tunable setting indicating that "I only care about content
gaps in the first 10K (or whatever) of the connection" could address that...

On Tue, Apr 9, 2019 at 9:36 AM Justin Azoff <justin at corelight.com> wrote:

> On Mon, Apr 8, 2019 at 8:13 PM Jim Mellander <jmellander at lbl.gov> wrote:
>> It might be valuable to have some (optional) way of accessing the byte
>> counts consisting the content gap(s).  If the content gap is somewhere in a
>> long tail, but DPD still fails, then the explanation could be something
>> other than a content gap.
>> On the other hand, maybe you're just thinking about content gaps at the
>> head of a connection before it has been fully analyzed.
> This is the missed_bytes field:
> missed_bytes: count &log &default = 0 &optional
> Indicates the number of bytes missed in content gaps, which is
> representative of packet loss. A value other than zero will normally cause
> protocol analysis to fail but some analysis may have been completed prior
> to the packet loss.
> --
> Justin
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