Re: I don't get any alerts when reading from file.

[sekure <sekure () gmail com>]

A lot of the snort signatures require an established connection (TCP
handshake).  Look for "flow:established" in the rule. If your pcap
file only contains the packets with the signatures and not the entire
session, snort will not trigger on them.

That's just my guess...

On Fri, 30 Jul 2004 12:55:29 +0300 (EEST), dimopoulos () mhl tuc gr
<dimopoulos () mhl tuc gr> wrote:
> Hullo.
> I'm using snort 2.1.3 on Windows 2000 SP4, on a 1.5 GHz Pentium 4
> processor with 512 MB and have libcap 3.0. For the past days I've been
> trying in vain to get snort to read from a file and log the alerts, yet
> nothing happens. I've editted snort.conf to include all the rule files and set all
> adresses to 'any'. For a typical execution I use: snort.exe -c snort.conf -r test.txt
> (test.txt is a random tcp dump file i have created using Ethereal and
> every packet in the file contains a signature.) I can see that the rules are read successfully from the '.rule' files
> "2060 Snort rules read...
> 2060 Option Chains ;inked into 254 Chain Headers"
> At the results section the "Breakdown by protocol:" is correct but the
> actions are all 0 (alerts=0,logged=0,passed=0). When I use -vd I can see
> the header and the data of the packets are all ok (and should generate
> alerts). I've tried the various -A switches, no change. After reading both the
> manual and the FAQ I still haven't found anything. Am I blind and have missed something obvious?
> Any help will be deeply appreciated and will help spare what little hair
> I haven't torn off my scalp yet!! Thanks!
>
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