RE: RE: Problems with HOME_NET and EXTERNAL_NET var 's

["Lauts, Anthony" <tlauts () twtr com>]

I am starting automaically via init.d, when i do a ps -ef it shows that it
started as such...
/usr/local/bin/snort -c /etc/snort/snort.conf -i eth0 -D

When I see the error, I start it as ...
/usr/local/bin/snort -i eth0 -n 1 -c /etc/snort/x11.rules

Here's my startup script:
------------------------------------------------------------
[root@DareDevil snort]# cat /etc/init.d/snort 
#!/bin/bash
# $Id$
# /etc/init.d/snort : start or stop the SNORT Intrusion Database System
#
# Written by Lukasz Szmit <ptashek () scg gliwice pl>
#
# Configuration

# set config file & path to snort executable
SNORT_PATH=/usr/local/bin
# I modfied the following line ...
CONFIG=/etc/snort/snort.conf   

# set interface
IFACE=eth0

# set GID/Group Name
# I modfied the following line ...      
#SNORT_GID=nogroup

# other options
OPTIONS="-D"

# End of configuration


test -x $SNORT_PATH/snort || exit 0

case "$1" in
     start)
        echo "Starting Intrusion Database System: SNORT"
# I modfied the following line ...
        $SNORT_PATH/snort -c $CONFIG -i $IFACE $OPTIONS
        if [ "`pidof $SNORT_PATH/snort`" ]; then
                echo "SNORT is up and running!"
        else
                exit 0
        fi
        echo -n "."
        ;;

     stop)
        echo "Stoping Intrusion Database System: SNORT"
        if [ "`pidof $SNORT_PATH/snort`" ] ; then

            kill -TERM `pidof $SNORT_PATH/snort`

            # Wait until the timeout
            count=120
            numdots=0
            while ([ $count != 0 ]) do
                let count=$count-1
                if [ "`pidof $SNORT_PATH/snort`" ] ; then
                    echo -n .
                    let numdots=$numdots+1
                    sleep 1
                else
                    count=0
                fi
            done

            # If it's not dead yet, kill it.

            if [ "`pidof $SNORT_PATH/snort`" ] ; then
                echo " TIMEOUT!"
                kill -KILL `$SNORT_PATH/snort`
            else
                case $numdots in
                  0) echo "." ;;
                  1) echo ;;
                  *) echo " done." ;;
                esac
            fi
        else
            echo "SNORT is  not running!";
        fi
        ;;
     restart)
        $0 stop
        $0 start
        ;;
     *)
        echo 'Usage: /etc/init.d/snort {start|stop|restart}'
        exit 1
        ;;
esac
exit 0
;;



------------------------------------------------------------
Here's my config file (comments and all)
------------------------------------------------------------

[root@DareDevil snort]# more /etc/snort/snort.conf 
#--------------------------------------------------
#   http://www.snort.org     Snort 2.0.0 Ruleset
#     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 network variables for your network
#  2) Configure preprocessors
#  3) Configure output plugins
#  4) 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 10.2.85.4/24

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

var EXTERNAL_NET !$HOME_NET

# 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

# Configure your service ports.  This allows snort to look for attacks 
# destined to a specific application only on the ports that application
# runs on.  For example, if you run a web server on port 8081, set your
# HTTP_PORTS variable like this:
#
# var HTTP_PORTS 8081
#
# Port lists must either be continuous [eg 80:8080], or a single port [eg
80].
# We will adding support for a real list of ports in the future.

# Ports you run web servers on
var HTTP_PORTS 80

# Ports you want to look for SHELLCODE on.
var SHELLCODE_PORTS !80

# Ports you do oracle attacks on
var ORACLE_PORTS 1521

# other variables
# 
# AIM servers.  AOL has a habit of adding new AIM servers, so instead of 
# modifying the signatures when they do, we add them to this list of 
# servers.
var AIM_SERVERS
[64.12.24.0/24,64.12.25.0/24,64.12.26.14/24,64.12.28.0/24,64.12.
29.0/24,64.12.161.0/24,64.12.163.0/24,205.188.5.0/24,205.188.9.0/24]

# Path to your rules files (this can be a relative path)
var RULE_PATH /etc/snort/

# Configure the snort decoder:
# ============================
#
# Stop generic decode events:
#
# config disable_decode_alerts
# config disable_decode_alerts
#
# Stop Alerts on experimental TCP options
#
# config disable_tcpopt_experimental_alerts
#
# Stop Alerts on obsolete TCP options
#
# config disable_tcpopt_obsolete_alerts
#
# Stop Alerts on T/TCP alerts
#
# config disable_ttcp_alerts
#
# Stop Alerts on all other TCPOption type events:
#
# config disable_tcpopt_alerts
#
# Stop Alerts on invalid ip options
#
# config disable_ipopt_alerts

# Configure the detection engine
# ===============================
#
# Use a different pattern matcher in case you have a machine with very
# limited resources:
#
# config detection: search-method lowmem


###################################################
# Step #2: Configure preprocessors
#
# General configuration for preprocessors is of 
# the form
# preprocessor <name_of_processor>: <configuration_options>

# frag2: IP defragmentation support
# -------------------------------
# This preprocessor performs IP defragmentation.  This plugin will also
detect
# people launching fragmentation attacks (usually DoS) against hosts.  No
# arguments loads the default configuration of the preprocessor, which is a 
# 60 second timeout and a 4MB fragment buffer. 

# The following (comma delimited) options are available for frag2
#    timeout [seconds] - sets the number of [seconds] than an unfinished 
#                        fragment will be kept around waiting for
completion,
#                        if this time expires the fragment will be flushed
#    memcap [bytes] - limit frag2 memory usage to [number] bytes
#                      (default:  4194304)
#
#    min_ttl [number] - minimum ttl to accept
# 
#    ttl_limit [number] - difference of ttl to accept without alerting
#                         will cause false positves with router flap
# 
# Frag2 uses Generator ID 113 and uses the following SIDS 
# for that GID:
#  SID     Event description
# -----   -------------------
#   1       Oversized fragment (reassembled frag > 64k bytes)
#   2       Teardrop-type attack

preprocessor frag2

# stream4: stateful inspection/stream reassembly for Snort
#----------------------------------------------------------------------
# Use in concert with the -z [all|est] command line switch to defeat 
# stick/snot against TCP rules.  Also performs full TCP stream 
# reassembly, stateful inspection of TCP streams, etc.  Can statefully
# detect various portscan types, fingerprinting, ECN, etc.

# stateful inspection directive
# no arguments loads the defaults (timeout 30, memcap 8388608)
# options (options are comma delimited):
#   detect_scans - stream4 will detect stealth portscans and generate alerts
#                  when it sees them when this option is set
#   detect_state_problems - detect TCP state problems, this tends to be very
#                           noisy because there are a lot of crappy ip stack
#                           implementations out there
#
#   disable_evasion_alerts - turn off the possibly noisy mitigation of
#                            overlapping sequences.
#
#
#   min_ttl [number]       - set a minium ttl that snort will accept to
#                            stream reassembly
#
#   ttl_limit [number]     - differential of the initial ttl on a session
versus
#                             the normal that someone may be playing games.
#                             Routing flap may cause lots of false
positives.
# 
#   keepstats [machine|binary] - keep session statistics, add "machine" to 
#                         get them in a flat format for machine reading, add
#                         "binary" to get them in a unified binary output 
#                         format
#   noinspect - turn off stateful inspection only
#   timeout [number] - set the session timeout counter to [number] seconds,
#                      default is 30 seconds
#   memcap [number] - limit stream4 memory usage to [number] bytes
#   log_flushed_streams - if an event is detected on a stream this option
will
#                         cause all packets that are stored in the stream4
#                         packet buffers to be flushed to disk.  This only 
#                         works when logging in pcap mode!
#
# Stream4 uses Generator ID 111 and uses the following SIDS 
# for that GID:
#  SID     Event description
# -----   -------------------
#   1       Stealth activity
#   2       Evasive RST packet
#   3       Evasive TCP packet retransmission
#   4       TCP Window violation
#   5       Data on SYN packet
#   6       Stealth scan: full XMAS
#   7       Stealth scan: SYN-ACK-PSH-URG
#   8       Stealth scan: FIN scan
#   9       Stealth scan: NULL scan
#   10      Stealth scan: NMAP XMAS scan
#   11      Stealth scan: Vecna scan
#   12      Stealth scan: NMAP fingerprint scan stateful detect
#   13      Stealth scan: SYN-FIN scan
#   14      TCP forward overlap

preprocessor stream4: detect_scans, disable_evasion_alerts

# tcp stream reassembly directive
# no arguments loads the default configuration 
#   Only reassemble the client,
#   Only reassemble the default list of ports (See below),  
#   Give alerts for "bad" streams
#
# Available options (comma delimited):
#   clientonly - reassemble traffic for the client side of a connection only
#   serveronly - reassemble traffic for the server side of a connection only
#   both - reassemble both sides of a session
#   noalerts - turn off alerts from the stream reassembly stage of stream4
#   ports [list] - use the space separated list of ports in [list], "all" 
#                  will turn on reassembly for all ports, "default" will
turn
#                  on reassembly for ports 21, 23, 25, 53, 80, 143, 110, 111
#                  and 513

preprocessor stream4_reassemble

# http_decode: normalize HTTP requests
# ------------------------------------
# http_decode normalizes HTTP requests from remote 
# machines by converting any %XX character 
# substitutions to their ASCII equivalent. This is
# very useful for doing things like defeating hostile
# attackers trying to stealth themselves from IDSs by
# mixing these substitutions in with the request. 
# Specify the port numbers you want it to analyze as arguments.
#
# Major code cleanups thanks to rfp
#
# unicode          - normalize unicode
# iis_alt_unicode  - %u encoding from iis 
# double_encode    - alert on possible double encodings
# iis_flip_slash   - normalize \ as /
# full_whitespace  - treat \t as whitespace ( for apache )
#
# for that GID:
#  SID     Event description
# -----   -------------------
#   1       UNICODE attack
#   2       NULL byte attack

preprocessor http_decode: 80 unicode iis_alt_unicode double_encode
iis_flip_slash full_whitespace

# rpc_decode: normalize RPC traffic
# ---------------------------------
# RPC may be sent in alternate encodings besides the usual
# 4-byte encoding that is used by default.  This preprocessor
# normalized RPC traffic in much the same way as the http_decode
# preprocessor.  This plugin takes the ports numbers that RPC 
# services are running on as arguments.
# The RPC decode preprocessor uses generator ID 106
#
# arguments: space separated list
# alert_fragments - alert on any rpc fragmented TCP data
# no_alert_multiple_requests - don't alert when >1 rpc query is in a packet
# no_alert_large_fragments - don't alert when the fragmented
#                            sizes exceed the current packet size
# no_alert_incomplete - don't alert when a single segment
#                       exceeds the current packet size

preprocessor rpc_decode: 111 32771

# bo: Back Orifice detector
# -------------------------
# Detects Back Orifice traffic on the network.  Takes no arguments in 2.0.
# 
# The Back Orifice detector uses Generator ID 105 and uses the 
# following SIDS for that GID:
#  SID     Event description
# -----   -------------------
#   1       Back Orifice traffic detected

preprocessor bo

# telnet_decode: Telnet negotiation string normalizer
# ---------------------------------------------------
# This preprocessor "normalizes" telnet negotiation strings from
# telnet and ftp traffic.  It works in much the same way as the 
# http_decode preprocessor, searching for traffic that breaks up
# the normal data stream of a protocol and replacing it with 
# a normalized representation of that traffic so that the "content"
# pattern matching keyword can work without requiring modifications.
# This preprocessor requires no arguments.
# Portscan uses Generator ID 109 and does not generate any SID currently.

preprocessor telnet_decode

# Portscan: detect a variety of portscans
# ---------------------------------------
# portscan preprocessor by Patrick Mullen <p_mullen () linuxrc net>
# This preprocessor detects UDP packets or TCP SYN packets going to
# four different ports in less than three seconds. "Stealth" TCP
# packets are always detected, regardless of these settings.
# Portscan uses Generator ID 100 and uses the following SIDS for that GID:
#  SID     Event description
# -----   -------------------
#   1       Portscan detect
#   2       Inter-scan info
#   3       Portscan End

# preprocessor portscan: $HOME_NET 4 3 portscan.log

# Use portscan-ignorehosts to ignore TCP SYN and UDP "scans" from
# specific networks or hosts to reduce false alerts. It is typical
# to see many false alerts from DNS servers so you may want to
# add your DNS servers here. You can all multiple hosts/networks
# in a whitespace-delimited list.
#
#preprocessor portscan-ignorehosts: 0.0.0.0

# arpspoof
#----------------------------------------
# Experimental ARP detection code from Jeff Nathan, detects ARP attacks, 
# unicast ARP requests, and specific ARP mapping monitoring.  To make use
# of this preprocessor you must specify the IP and hardware address of hosts
on 
# the same layer 2 segment as you.  Specify one host IP MAC combo per line.
# Also takes a "-unicast" option to turn on unicast ARP request detection. 
# Arpspoof uses Generator ID 112 and uses the following SIDS for that GID:
#  SID     Event description
# -----   -------------------
#   1       Unicast ARP request
#   2       Etherframe ARP mismatch (src)
#   3       Etherframe ARP mismatch (dst)
#   4       ARP cache overwrite attack

#preprocessor arpspoof
#preprocessor arpspoof_detect_host: 192.168.40.1 f0:0f:00:f0:0f:00

# Conversation
#------------------------------------------
# This preprocessor tracks conversations for tcp, udp and icmp traffic.  It
# is a prerequisite for running portscan2.
#
# allowed_ip_protcols 1 6 17
#      list of allowed ip protcols ( defaults to any )
#
# timeout [num]
#      conversation timeout ( defaults to 60 )
#
#
# max_conversations [num] 
#      number of conversations to support at once (defaults to 65335)
#
#
# alert_odd_protocols
#      alert on protocols not listed in allowed_ip_protocols
#
# preprocessor conversation: allowed_ip_protocols all, timeout 60,
max_conversations 3000
#
# Portscan2
#-------------------------------------------
# Portscan 2, detect portscans in a new and exciting way.  You must enable
# spp_conversation in order to use this preprocessor.
#
# Available options:
#       scanners_max [num] 
#       targets_max [num]
#       target_limit [num]
#       port_limit [num]
#       timeout [num]
#       log [logdir]
#
#preprocessor portscan2: scanners_max 256, targets_max 1024, target_limit 5,
port_limit 20, timeout 60

# Too many false alerts from portscan2? Tone it down with
# portscan2-ignorehosts!
#
# A space delimited list of addresses in CIDR notation to ignore
#
# preprocessor portscan2-ignorehosts: 10.0.0.0/8 192.168.24.0/24
#

# Experimental Perf stats
# -----------------------
# No docs. Highly subject to change.
# 
# preprocessor perfmonitor: console flow events time 10

####################################################################
# Step #3: Configure output plugins
#
# Uncomment and configure the output plugins you decide to use.
# General configuration for output plugins is of the form:
#
# output <name_of_plugin>: <configuration_options>
#
# alert_syslog: log alerts to syslog
# ----------------------------------
# Use one or more syslog facilities as arguments.  Win32 can also
# optionally specify a particular hostname/port.  Under Win32, the
# default hostname is '127.0.0.1', and the default port is 514.
#
# [Unix flavours should use this format...]
# output alert_syslog: LOG_AUTH LOG_ALERT
#
# [Win32 can use any of these formats...]
# output alert_syslog: LOG_AUTH LOG_ALERT
# output alert_syslog: host=hostname, LOG_AUTH LOG_ALERT
# output alert_syslog: host=hostname:port, LOG_AUTH LOG_ALERT

# log_tcpdump: log packets in binary tcpdump format
# -------------------------------------------------
# The only argument is the output file name.
#
# output log_tcpdump: tcpdump.log

# database: log to a variety of databases
# ---------------------------------------
# See the README.database file for more information about configuring
# and using this plugin.
#
# output database: log, mysql, user=root password=test dbname=db
host=localhost
# output database: alert, postgresql, user=snort dbname=snort
# output database: log, unixodbc, user=snort dbname=snort
# output database: log, mssql, dbname=snort user=snort password=test

# unified: Snort unified binary format alerting and logging
# -------------------------------------------------------------
# The unified output plugin provides two new formats for logging
# and generating alerts from Snort, the "unified" format.  The
# unified format is a straight binary format for logging data 
# out of Snort that is designed to be fast and efficient.  Used
# with barnyard (the new alert/log processor), most of the overhead
# for logging and alerting to various slow storage mechanisms
# such as databases or the network can now be avoided.  
#
# Check out the spo_unified.h file for the data formats.
#
# Two arguments are supported.
#    filename - base filename to write to (current time_t is appended)
#    limit    - maximum size of spool file in MB (default: 128)
#
# output alert_unified: filename snort.alert, limit 128
# output log_unified: filename snort.log, limit 128

# You can optionally define new rule types and associate one or 
# more output plugins specifically to that type.
#
# This example will create a type that will log to just tcpdump.
# ruletype suspicious
# {
#   type log
#   output log_tcpdump: suspicious.log
# }
#
# EXAMPLE RULE FOR SUSPICIOUS RULETYPE:
# suspicious $HOME_NET any -> $HOME_NET 6667 (msg:"Internal IRC Server";)
#
# This example will create a rule type that will log to syslog
# and a mysql database.
# ruletype redalert
# {
#   type alert
#   output alert_syslog: LOG_AUTH LOG_ALERT
#   output database: log, mysql, user=snort dbname=snort host=localhost
# }
ruletype redaert
{
 type alert
 output alert_syslog: LOG_AUTH LOG_ALERT
 output database: log, mysql, user=snort password=**(hidden)** dbname=snort
host=localhost
}
#
# EXAMPLE RULE FOR REDALERT RULETYPE
# redalert $HOME_NET any -> $EXTERNAL_NET 31337 (msg:"Someone is being
LEET"; \
#   flags:A+;)

#
# Include classification & priority settings
#

include classification.config

#
# Include reference systems
#

include reference.config

####################################################################
# Step #4: Customize your rule set
#
# Up to date snort rules are available at http://www.snort.org
#
# The snort web site has documentation about how to write your own 
# custom snort rules.
#
# The rules included with this distribution generate alerts based on
# on suspicious activity. Depending on your network environment, your
# security policies, and what you consider to be suspicious, some of
# these rules may either generate false positives ore may be detecting
# activity you consider to be acceptable; therefore, you are
# encouraged to comment out rules that are not applicable in your
# environment.
#
# Note that using all of the rules at the same time may lead to
# serious packet loss on slower machines. YMMV, use with caution,
# standard disclaimers apply. :)
#
# The following individuals contributed many of rules in this
# distribution.
#
# Credits:
#   Ron Gula <rgula () securitywizards com> of Network Security Wizards
#   Max Vision <vision () whitehats com>
#   Martin Markgraf <martin () mail du gtn com>
#   Fyodor Yarochkin <fygrave () tigerteam net>
#   Nick Rogness <nick () rapidnet com>
#   Jim Forster <jforster () rapidnet com>
#   Scott McIntyre <scott () whoi edu>
#   Tom Vandepoel <Tom.Vandepoel () ubizen com>
#   Brian Caswell <bmc () snort org>
#   Zeno <admin () cgisecurity com>
#   Ryan Russell <ryan () securityfocus com>
# 
#=========================================
# Include all relevant rulesets here 
# 
# shellcode, policy, info, backdoor, and virus rulesets are 
# disabled by default.  These require tuning and maintance.  
# Please read the included specific file for more information.
#=========================================

include $RULE_PATH/bad-traffic.rules
include $RULE_PATH/exploit.rules
include $RULE_PATH/scan.rules
include $RULE_PATH/finger.rules
include $RULE_PATH/ftp.rules
include $RULE_PATH/telnet.rules
include $RULE_PATH/rpc.rules
include $RULE_PATH/rservices.rules
include $RULE_PATH/dos.rules
include $RULE_PATH/ddos.rules
include $RULE_PATH/dns.rules
include $RULE_PATH/tftp.rules

include $RULE_PATH/web-cgi.rules
include $RULE_PATH/web-coldfusion.rules
include $RULE_PATH/web-iis.rules
include $RULE_PATH/web-frontpage.rules
include $RULE_PATH/web-misc.rules
include $RULE_PATH/web-client.rules
include $RULE_PATH/web-php.rules

include $RULE_PATH/sql.rules
include $RULE_PATH/x11.rules
include $RULE_PATH/icmp.rules
include $RULE_PATH/netbios.rules
include $RULE_PATH/misc.rules
include $RULE_PATH/attack-responses.rules
include $RULE_PATH/oracle.rules
include $RULE_PATH/mysql.rules
include $RULE_PATH/snmp.rules

include $RULE_PATH/smtp.rules
include $RULE_PATH/imap.rules
include $RULE_PATH/pop2.rules
include $RULE_PATH/pop3.rules

include $RULE_PATH/nntp.rules
include $RULE_PATH/other-ids.rules
# include $RULE_PATH/web-attacks.rules
# include $RULE_PATH/backdoor.rules
# include $RULE_PATH/shellcode.rules
# include $RULE_PATH/policy.rules
# include $RULE_PATH/porn.rules
# include $RULE_PATH/info.rules
# include $RULE_PATH/icmp-info.rules
# include $RULE_PATH/virus.rules
# include $RULE_PATH/chat.rules
# include $RULE_PATH/multimedia.rules
# include $RULE_PATH/p2p.rules
include $RULE_PATH/experimental.rules
include $RULE_PATH/local.rules



-----Original Message-----
From: Gordon Cunningham
To: Lauts, Anthony; snort-users () lists sourceforge net
Sent: 8/31/2003 11:06 PM
Subject: RE: [Snort-users] RE: Problems with HOME_NET and EXTERNAL_NET var's

Post your snort command line used to start it, and your config file.
We'll
take a look.


- Gordon

"When I finally found a spam filter that worked, I no longer received
ANY
email."

 -----Original Message-----
From:   snort-users-admin () lists sourceforge net
[mailto:snort-users-admin () lists sourceforge net]  On Behalf Of Lauts,
Anthony
Sent:   Sunday, August 31, 2003 10:24 PM
To:     ''snort-users () lists sourceforge net' '
Subject:        [Snort-users] RE: Problems with HOME_NET and
EXTERNAL_NET var's

Thanks for the reply Gary.

  Yes, I am on an Extreme switch, but I have port mirroring set up.  I
have
tested it with ethereal and am seeing packets that snort should be
catching.
It should still see packets that I am attacking that particular IP
address
with.

  That was also a typo in my message forgetting to put the $ when
referencing !$HOME_NET.  I did try that also.

  I get the same error no matter what ruleset I attempt to run
"ERROR: Undefined variable name: (/etc/snort/*****.rule:#):
EXTERNAL_NET"

  I have read pretty much every forum I could find, even bought the book
from Syngress adn read it cover to cover.  Wondering if this isn't more
of a
Linux environment issue instead of a SNORT configuration problem.

  Any other ideas?  I am sure it is something that I am just overlooking
(my
brain is fried from running around fixing windows machines from the
Welchi
worm all week!)

Thanks,
    Tony


-----------------------------------------
 Are you on a switch, by any chance?  Your current settings should work,
but
 if you are on a switch, you'll only see traffic for that machine and
 broadcasts.  Just comment out the X11 rule to see if you can get snort
 running.

 Also, referencing other variables needs the "$", as in:

 var EXTERNAL_NET !$HOME_NET


 - Gordon

 "When I finally found a spam filter that worked, I no longer received
ANY
 email."


-----Original Message-----
From: Lauts, Anthony
To: 'snort-users () lists sourceforge net'
Sent: 8/31/2003 12:18 PM
Subject: Problems with HOME_NET and EXTERNAL_NET var's

I have set up and installed Snort and Acid on a RH9 box with a single
NIC using Patrick Harper's online Snort Installation Manual (Thanks
Patrick).. it looks like I have one last problem to overcome.

Everything loads fine, but I am not logging anything.  I have traced
this down to my snort.conf file and the EXTERNAL_NET and HOME_NET
variables.  I have tried every iteration of these (i.e., using
$eth0_ADDRESS, 10.2.85.0/24, any) and still receive the following error
when trying any of the supplied rulesets:

_______________________start of snip_________________________________
# /usr/local/bin/snort -i eth0 -n 1 -c /etc/snort/x11.rules
Running in IDS mode
Log directory = /var/log/snort

Initializing Network Interface eth0

        --== Initializing Snort ==--
Initializing Output Plugins!
Decoding Ethernet on interface eth0
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file /etc/snort/x11.rules

+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
ERROR: Undefined variable name: (/etc/snort/x11.rules:8): EXTERNAL_NET
Fatal Error, Quitting..
_______________________end of snip_________________________________

My NET variables are currently defined as follows:


var HOME_NET 10.2.85.0/24
var EXTERNAL_NET any


I have even tried saying "!HOME_NET" for the EXTERNAL_NET var.

I also have to manually type in "ifconfig etho promisc" to get eth0 to
enter promiscuious mode after a restart of the box.

If anyone has any experience with this, it would b greatly appreciated.

Tony Lauts


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