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Tue, 01 Jul 2008

Passive OS fingerprinting.

I've updated OSF modules to xtables, so you have to enable its support in kernel config and get recent iptables (I tested with 1.4.1.1, which is the latest release to date).

OSF allows you to match incoming packets by different sets of SYN-packet and determine, which remote system is on the remote end, so you can make decisions based on OS type and even version at some degreee.

Installation instruction, example and source code can be found on homepage.

I've also sent it to netfilter-devel@ and netdev@ maillists, since my previous mails never appeared there likely because of spam filters.

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