Nmap Security Tool Survey
spring writes "Every so often, the author of everyone's favorite network reconnaissance tool, nmap, runs a survey to determine which security-oriented software products are most popular. This year's tool survey was just released, and it contains some interesting results. Old favorites like Nessus, Snort, Netcat, and Ethereal made the list, of course. SAINT and SARA are still around. But a number of new tools appeared this year, like Windows-only GFI LANguard, SuperScan, and Cain & Abel. Nikto and Kismet demonstrate the growing importance of wireless networks. The survey contains many good tools. Certainly worth a read."
remember that these tools aren't going to be the "end all/be all" of network security.
You also have to have a good preventive security plan, which these tools will help out in. However, there should also be a plan of action should these security measures get bypassed (i.e. an insider job, program exploits, trojans, etc...)
But that's just my contention...
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You'd be surprised. tcpdump/ethereal is great for say, when some jerk is trying to DOS you and you need to know how.
Knowing the how allows you to put in filters. Filters allows you to operate.
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"I'm not bright. Big words confuse me. But Wanda loves me and that should be enough for you." - Cosmo
It's a nice way to check a connection is not made, that packets do not go out of one or another interface, that traffic is encrypted. tcpdump can do the same (except follow TCP traffic, which is very enlightning for users who like telnet).
So while Ethereal does not increase security by itself, it does add security by making it possible to check out the packets. That makes is IMHO a security tool.
Your analogy to file sharing is bad. A better analogy would be to weapons.
In some la-la fantasy world where violence does not exist, no one would no needs weapons for self-defense. In reality, however, not allowing weapons puts the law-abiding at the mercy of criminals, who may still yet possess illegal weapons.
In some la-la fantasy world where exploits do not exist, no would need to audit their network for security holes. In reality, however, not allowing such tools would leave law-abiding network administrators at the mercy of those who would scan their networks with an illegal tool and discover holes that the administrators have never even heard of.
When a technology A has "strong dark uses", but one of its legitimate uses is defending against technology A, and it is in fact one of the best ways of defending against A, it is clear that making it illegal is sheer folly. For unless you stamp it out entirely, you are worse off than you would be if it were legal, and you could at least use it against itself.