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Thats where the white list comes into play. |
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On Thu, 2004-01-08 at 19:22, Alexander Schreiber wrote: |
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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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> |
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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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> |
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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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> |
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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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> |
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> Regards, |
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> Alex. |
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