Active detection methods need sending of malformed packets to host and analyzing of their responses.But these are easily detected and filtering is also easy by ACL and firewalls.
Thus in this new method regular packets are send to the host to generate the responses.The request may be like the request to a web page or file.
This fools the firewall and ACL rules.The packet causes some ICMP error message.This is non detectable.This may pass through the firewall easily as this is similar to normal traffic.
The outgoing ICMP message is allowed and this is studied to detect the OS.
The Main thing : No system admin can disable the Outgoing ICMP error messages.However he can block certain selected messages.This is studied to pin point the OS.
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Wednesday, November 18, 2009
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