[Snort-users] preprocessor sfportscan does not generate alerts

Marc Belanger mab_snort at ...125...
Mon Feb 18 12:16:47 EST 2013

Thanks for your reply...
Q: "do you have those specific rules enabled?"A: My understanding is that by removing the # character the preprocessor is activated.     I am not aware of a sfportscan.rule file.    scan.rules is not commented out (no # in front of it)
Q: "do your scans follow the specific portscan rules that snort has in the preprocessor?"A: preprocessor sfportscan: proto  { tcp } scan_type { all } (...)    or preprocessor sfportscan: proto  { all } scan_type { all } (...)    does not generate alerts for     nmap -sS <dest_ip_address>

> Date: Fri, 15 Feb 2013 23:10:52 -0500
> From: wkitty42 at ...14940...
> To: snort-users at lists.sourceforge.net
> Subject: Re: [Snort-users] preprocessor sfportscan does not generate alerts
> On 2/15/2013 17:04, Marc Belanger wrote:
> > Hi,
> >
> > How do I troubleshoot a Snort install that generates no alert when the
> > sfportscan preprocessor is activated?
> do you have those specific rules enabled?
> do your scans follow the specific portscan rules that snort has in the preprocessor?
> i have seen some scans that do not trigger because there are no rules for 
> them... or they don't comply with the existing rules...
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