Best intrusion detection system software for Linux

I need a best Host based and Network based intrusion detection system software (open source) for linux os.
rajasekarramasamyAsked:
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0renConnect With a Mentor Commented:
you should try snort
http://www.snort.org/
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0renCommented:
you can complete the security package with nessus security scanner
http://www.nessus.org/nessus/
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rajasekarramasamyAuthor Commented:
Hi 0ren,

The both software you have mentioned above are open source?. From snort site i am unable to download rules for snort.
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0renCommented:
snort is open source.
with nessus im not sure. its free though.
about the rules did you register ?
you have rules for subscribed , registered and unregistered users.
you will need this section
Sourcefire VRT Certified Rules - The Official Snort Ruleset (registered user release)
on this url
http://www.snort.org/pub-bin/downloads.cgi
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rajasekarramasamyAuthor Commented:
I have registerd now. I can able to download rules.

snort is a network based IDS is correct? Is there any Host based IDS for linux?
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0renCommented:
yes it is
for HIDS you can try
http://www.ossec.net/
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