issue of installing Snort_2.8.4.1 and Barnyard2 in Ubunto 9.10

[Jun Wan <junwei_wan () hotmail com>]

Hi,

I am new to Snort, I followed the instructions on this url:  https://wwwx.cs.unc.edu/~hays/archives/work/index.php

All went well until I reached the following stage:

  "Now a quick test. Run the following and see if snort runs:

sudo snort -c /etc/snort/snort.conf -i eth1"

After running the command line above, I got the following outcomes:

Running in IDS mode

        --== Initializing Snort ==--
Initializing Output Plugins!
Initializing Preprocessors!
Initializing Plug-ins!
Parsing Rules file /etc/snort/snort.conf
Var 'HOME_NET' redefined
PortVar 'HTTP_PORTS' defined :  [ 80 ]
PortVar 'SHELLCODE_PORTS' defined :  [ 0:79 81:65535 ]
PortVar 'ORACLE_PORTS' defined :  [ 1521 ]
Frag3 global config:
.....
.....

+++++++++++++++++++++++++++++++++++++++++++++++++++
Initializing rule chains...
ERROR: Undefined variable name: (/etc/snort/rules/bad-traffic.rules:27): EXTERNAL_NET
Fatal Error, Quitting..

Is there anyone know what's this all about? Would you please let me know "how to" fix this "Fatal Error"?  what should 
I do next?

Any information and help would be much appreciated.

Regards

John


                                          
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