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I think OS detection's success in part depends on the number of ports exposed. |
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I for one have only 2 ports exposed, one is SSH and the other is http. Nmap |
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often detects my system as a palm pilot (wierd huh). |
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|
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One other thing you can look into is randomized tcp sequence numbers. I am |
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not sure but I think this is in some of the newer kernels. |
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|
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-Jonathan S. Romero |
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|
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On Sunday 05 October 2003 06:59 am, Nick Van Vlaenderen wrote: |
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> Hi all, |
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> |
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> I was wondering how I could hide my uptime and OS for portscans. If |
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> someone scans my server (for example using Nmap), he can see what OS I am |
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> running and what the uptime of the box is. Does anyone know which firewall |
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> rule I need to prevent this? And how does Nmap collect this information? |
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> Is it related to what services there are running on the server? |
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> |
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> Regards, |
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> |
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> Nick Van Vlaenderen |
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> |
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> -- |
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> The software said "Microsoft Windows 95 or better", so I tried *nix! |
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> Bow for opensource development! |
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> |
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> Aoccdrnig to rscheearch at an Elingsh uinervtisy, it deosn't mttaer in |
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> waht oredr the ltteers in a wrod are, the olny iprmoetnt tihng is taht the |
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> frist and the lsat ltteer is at the rghit pclae. The rset can be a toatl |
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> mses and you can sitll raed it wouthit porbelms. Tihs is bcuseae we do not |
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> raed ervey lteter by itslef, but the wlohe wrod. |
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