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https://bro-tracker.atlassian.net/browse/BIT-1119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15304#comment-15304
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Jon Siwek commented on BIT-1119:
--------------------------------
{quote}
I'm going ahead merging this but I'm wondering about the new
detect_filtered_trace flag. It's pretty common (in the research world, anyways
to run Bro on a SYN/FIN/RST trace and I imagine having this by default off can
add a lot for warnings in that case. Can we add some other heuristic to detect
such a trace (i.e., guess whether detect_filtered_trace should be on) ? A
(very) coarse approach would simply be a global variable recording if we've
ever seen anything else than a TCP control packet. Thoughts?
{quote}
If a person found out that Bro automatically switched modes part way through
the trace, they will probably just re-run after manually toggling the option,
right? Maybe treat it in a similar way to checksums -- have a FAQ and/or have
some script warn if all TCP connections are missing 100% of content and suggest
toggling {{detect_filtered_trace}} if the person would like to trade off
correctness for minimized output. But if it's actually not that important for
a person using filtered traces to minimize output, I think it's fine enough as
is?
> topic/jsiwek/tcp-improvements
> -----------------------------
>
> Key: BIT-1119
> URL: https://bro-tracker.atlassian.net/browse/BIT-1119
> Project: Bro Issue Tracker
> Issue Type: Improvement
> Components: Bro
> Affects Versions: git/master
> Reporter: Jon Siwek
> Fix For: 2.3
>
>
> This branch is in the bro, bro-testing, and bro-testing-private repos and has
> a few changes to improve reporting of TCP connection sizes and gaps (commit
> messages explain in more detail).
> The baseline changes in the external repos all seemed reasonable/explainable
> (or actually fix a problem). There's too much changed to go through
> case-by-case and actually check things, but I did do closer examinations of
> unique differences as I came across them (e.g. try to corroborate Bro results
> via wireshark). Then for those that seem to follow the same trend as
> something I already inspected, I wouldn't manually check.
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