[NTLUG:Discuss] linux based security tool...recommendation

[Chris Cox]

Richard Geoffrion wrote:
> Are there any tools out there that can be used to evaluate a linux based
> network for security faux-pas?  Maybe one that can compare results after
> being run from outside the network then inside the network?  Of course there
> are always tools like nmap to do port testing...but...what about SATAN? (in
> the church-lady's voice)  Exactly how easy is it to be hacked if one becomes
> a target?

nessus http://www.nessus.org
It's a scanner and vuln checker.