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Author Re: [Snort-users] Can't put log message to the special
Matt Kettler

2004-09-28, 5:47 pm

I think you are missing one minor concept of Snort. Snort has alerts, and=20
logs. Both. Alerts contain rule matches, logs contain packet captures.

Using your "output alert_fast: /home/snort/fst.log" you've set where your=20
ALERTS go, but not where your logs go.

The -l command line specifies where both go. And the default format for=20
logs is ip-hierarchy. However, this is IN ADDITION to the alert file.

Might i suggest switching to tcpdump binary logging or unified logging for=
=20
your packet captures:

output alert_fast: /home/snort/fst.log
output log_tcpdump: /home/snort/tcpdump.log

This will give you two files, one with your fast mode alerts, and one=20
fast-written binary log of packets that you can later read with tcpdump -r.

At 10:06 PM 9/27/2004, Peixiao Guo wrote:
>output alert_fast: /home/snort/fst.log
>log tcp any any -> any 80 (flags:S;)
>I just want to put the =93alert_fast=94 message to the file=20
>/home/snort/fst.log, but I will get an error if I run this command:
>snort =96c snort.conf =96d
>the err messages as below:
>Running in IDS mode
>Log directory =3D /var/log/snort
>ERROR:
>[!] ERROR: Can not get write access to logging directory "/var/log/snort".
>(directory doesn't exist or permissions are set incorrectly
>or it is not a directory at all)
>Fatal Error, Quitting..
>When I run this command:
>snort =96c snort.conf =96dl /home/snort/
>then all output message will be recorded in IP hierarchy in /home/snort=20
>directory.
>
>I m wandering how to log the output message to a /home/snort/fst.log file
>Can any senior one give me a directive?
>Thanks very very much!




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