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

anthony kasza anthony.kasza at gmail.com
Tue Apr 9 21:11:00 PDT 2019

I like the idea of logging gap ranges for a connection. Could a vector be
used to store gap start and gap stop offsets?


On Tue, Apr 9, 2019, 11:01 Jim Mellander <jmellander at lbl.gov> wrote:

> 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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