Snort mailing list archives

Re: Snort v2.6.0 and Excessive Memory


From: Zakai Kinan <titanyen2000 () yahoo com>
Date: Thu, 29 Jun 2006 11:11:09 -0700 (PDT)

I use this configuration option "config detection:
search-method lowmem".  I had the same problem before
using it.  Keep in mind that I have a small network.

ZK

--- Ron Jenkins <rjenkins () dibr net> wrote:

I had to back off from v2.6.0, because it was not
detect a high
percentage of alerts.

 

With 1GB of RAM and Snort v2.4.5 we still have 300MB
free, but with
v2.6.0 there is only 70MB free.

 

Below is the config detection setting being used;
config detection:
search-method ac-sparsebands

 

Does anyone have any ideas? Below is the
configuration being used and
the load line.

 

Thanks...

 

 

/usr/local/bin/snort -i nic0 -e -d -D -c
/etc/snort/snort.conf -l
/var/log/snort

 

 

 

#--------------------------------------------------

#   http://www.snort.org     Snort 2.6.0 config file

#     Contact: snort-sigs () lists sourceforge net

#--------------------------------------------------

# $Id$

#

###################################################

# This file contains a sample snort configuration. 

# You can take the following steps to create your
own custom
configuration:

#

#  1) Set the variables for your network

#  2) Configure dynamic loaded libraries

#  3) Configure preprocessors

#  4) Configure output plugins

#  5) Add any runtime config directives

#  6) Customize your rule set

#

###################################################

# Step #1: Set the network variables:

#

# You must change the following variables to reflect
your local network.
The

# variable is currently setup for an RFC 1918
address space.

#

# You can specify it explicitly as: 

#

# var HOME_NET 10.1.1.0/24

#

# or use global variable $<interfacename>_ADDRESS
which will be always

# initialized to IP address and netmask of the
network interface which
you run

# snort at.  Under Windows, this must be specified
as

# $(<interfacename>_ADDRESS), such as:

#

$(\Device\Packet_{12345678-90AB-CDEF-1234567890AB}_ADDRESS)

#

# var HOME_NET $eth0_ADDRESS

#

# You can specify lists of IP addresses for HOME_NET

# by separating the IPs with commas like this:

#

# var HOME_NET [10.1.1.0/24,192.168.1.0/24]

#

# MAKE SURE YOU DON'T PLACE ANY SPACES IN YOUR LIST!

#

# or you can specify the variable to be any IP
address

# like this:

 

var HOME_NET any

 

# Set up the external network addresses as well.  A
good start may be
"any"

var EXTERNAL_NET any

 

# Configure your server lists.  This allows snort to
only look for
attacks to

# systems that have a service up.  Why look for HTTP
attacks if you are
not

# running a web server?  This allows quick filtering
based on IP
addresses

# These configurations MUST follow the same
configuration scheme as
defined

# above for $HOME_NET.  

 

# List of DNS servers on your network 

var DNS_SERVERS $HOME_NET

 

# List of SMTP servers on your network

var SMTP_SERVERS $HOME_NET

 

# List of web servers on your network

var HTTP_SERVERS $HOME_NET

 

# List of sql servers on your network 

var SQL_SERVERS $HOME_NET

 

# List of telnet servers on your network

var TELNET_SERVERS $HOME_NET


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Using Tomcat but need to do more? Need to support web services, security?
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