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On Thu, Jan 08, 2004 at 06:57:28PM +0100, Daniel Privratsky wrote: |
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> Wrong. |
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> |
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> 1) If you don't receive "destination unreachable" packet, you know |
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> nothing about the target host yet. This is not perfect-network world. |
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> There can be other fw/router anywhere in the way, killing this type of |
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> icmp traffic. |
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> |
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> 2) It slows scans a lot. |
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Only for people too stupid for doing port scans (a rare defect even |
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among script kiddies). |
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> You can of course do scannig in parallel, but |
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> don't be surprised, when you find yourself killed with no mercy by IDS, |
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> after matching SYN threshold. 1000+ syns/sec form IP adress to monitored |
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> system is sure ban. |
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Cool. Your IDS just banned the IPs of your customers mail-, web- and |
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proxy-servers. Spoofing IP adresses just to mess with such automatic |
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systems is easy. |
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Regards, |
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Alex. |
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-- |
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"Opportunity is missed by most people because it is dressed in overalls and |
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looks like work." -- Thomas A. Edison |
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-- |
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