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>I am using bro 0.7a90 and was wondering if analysis of other methods
>are being done
>with latest version ...?
It seems a great different has been done. You better read http-detail.bro
http-reply.bro http-request.bro .
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> I can see that Bro supports HTTP methods - GET, HEAD and POST.
> But in between i see entries in weird.log saying -
> 1041827706.208639 18.104.22.168/2254 > *.*.*.*/http: HTTP_unknown_method
> I am using bro 0.7a90 and was wondering if analysis of other methods are
> being done
> with latest version ...?
There's no analysis of additional methods in 0.8, but it knows about
(= won't complain about) the following additional methods:
"OPTIONS", "PUT", "DELETE", "TRACE", "CONNECT",
"PROPFIND", "PROPPATCH", "MKCOL", "DELETE", "PUT",
"COPY", "MOVE", "LOCK", "UNLOCK",
> The author said Bro is modified to generate the 41 features, I
> would preciated if someone is kind enough to give me some hints how
> to do this. I am sure a event analyser and handler sould added to
> Bro, but where, how and when to invoke the event handler.
Presumably, yes, they wrote policy scripts, and perhaps also extended
the event engine. But it seems you should ask the authors directly
to get the details.
> You could also just watch the variable 'drop' returned by pcap_stats(
> ) to see if there are drops.
Yes, but only on some systems, and for some types of drops. As you mention,
on some systems it's not accurate, due to kernel bookkeeping deficiencies,
or because loss occurs on the NIC (which can't always correctly report it)
or at the tap rather than in the kernel.
> However, I am still can't understand why all the status of connection not
> from/to my host is "S0", which means "no answer", while my host's
> connections were all right.
That's very strange, unless in your setup Bro is massively dropping packets.
So the next thing to do is use Bro's "-w tracefile" option to record the
packets it's analyzing. Next time you find an S0 FTP session which you're
sure was successful, extract the corresponding packets from the trace.
If there are just initial SYNs and nothing else, then Bro was correct, and
you were mistaken regarding that particular session being successful.
If on the other hand there's an initial SYN, no SYN-ACK, but a bunch of
subsequent packets related to the connection, then Bro is dropping packets.
I can help with this analysis (send me the trace off-line) if needed.
Thank your answer, Mr. Paxon!
However, I am still can't understand why all the status of connection not
from/to my host is "S0", which means "no answer", while my host's
connections were all right. In my network, my computer was running
Redhat7.3, others windows. As I known, Bro is a network IDS, I think it
should moniter all packets in my network. It is unbleveable that all other
connections were not finished succesfully.
Waiting for your answer. Thank you!
>From: Vern Paxson <vern(a)icir.org>
>To: "Anderson Lee" <andersonlee2002(a)hotmail.com>
>Subject: Re: about Date: Fri, 03 Jan 2003 10:02:49 -0800
> > While the connection
> > between other hosts(also in my network) can not show all information,
> > as src_bytes and dst_bytes, instead of number it show "?".
>The key for those connections is their status. In this case, it is S0:
> > 1041604588.107852 ? ftp ? ? 10.1.2.251 10.1.2.28 S0 X
> > ~~~ ~~~~~
>which (as explained in doc/conn-logs) means "no answer". Because there
>was no answer, the connection does not have a meaningful duration, or
>volume of bytes sent in either direction.
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> While the connection
> between other hosts(also in my network) can not show all information, such
> as src_bytes and dst_bytes, instead of number it show "?".
The key for those connections is their status. In this case, it is S0:
> 1041604588.107852 ? ftp ? ? 10.1.2.251 10.1.2.28 S0 X
> ~~~ ~~~~~
which (as explained in doc/conn-logs) means "no answer". Because there
was no answer, the connection does not have a meaningful duration, or
volume of bytes sent in either direction.