Error with snort rule files

[Kmar via Snort-sigs <snort-sigs () lists snort org>]

Hello, I have attempting to use various rule files such as bad-traffic.rules, dos.rules, etc, to analyze a pcap file 
for malicious traffic. Unfortunately,  Ir receive the same error for every rule file I attempt to use.  It works with 
the regular snort.conf file.

I use the following command:

Snort -r pcapfilename.pcap -c rulefilename.rules 

I receive the following error: 

Undefined variable in the string $EXTERNAL_NET     

I have edited the rule files but nothing seems to work properly.


Sent from Mail for Windows 10

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