Free network vulerabilty scanners

I have a client that needs a vulnerability scan done right away due to an audit. Is there a good, free software that I can download and run from outside the network to see what is opened.
ajdratchAsked:
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Patrick BogersDatacenter platform engineer LindowsCommented:
Hi

There is Nessus framework, free and quiet reliable BUT there is NO automated tool which gives you a complete view of your vulnerabillities because of a lot of pentest techniques simply can not be simulated by repetative software.

Like most tools Nessus will give you some directions where to look for cave-ats.

BTW: what is the scope for this pentest? A server, a network, a web-app, e-commerce yes or no, an application.....
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netcmhCommented:
There's a whole bunch of tools that can do what you're asking for. Check this list out: http://sectools.org/tag/vuln-scanners/

Again, it is not the tool, but the deciphering of the output that would assign value to your report.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Fifteen day free trial from Tenable:
http://www.tenable.com/products/nessus/select-your-operating-system

Microsoft Baseline Security Analyzer
http://www.microsoft.com

GFI Languard
http://www.gfi.com
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madunix (Fadi SODAH)Commented:
Look at Nessus; NeXpose; Qualys Guard; Retina Network Security Scanner; Saintbox; Shadow Security Scanner; Automated Scanning; FS 1000; Internet Scanner; LANguard

http://sectools.org/
http://www.cirt.net/nikto2
http://www.parosproxy.org/index.shtml
http://www.nta-monitor.com/tools/ike-scan/
http://www.backtrack-linux.org/
http://www.metasploit.com/
http://nmap.org/zenmap/
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ajdratchAuthor Commented:
Great links. I should have been clearer that I am not looking for internal scans, only scanning from outside the network to see what is open and unsecured though the Firewall.
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Patrick BogersDatacenter platform engineer LindowsCommented:
NMAP is your man :) thanks for the points.
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Nap is what you want as well as try Shieldsup online from FTC.com.
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netcmhCommented:
Thanks for the grade. Good luck.
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