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3.4 What are some cheap packet screening tools?

  The Texas AMU security tools include software for implementing screening routers. Karlbridge is a PC-based screening router kit available from ftp://ftp.net.ohio-state.edu/pub/kbridge/ . A version of the Digital Equipment Corporation ``screend'' kernel screening software is available for BSD-derived operating systems. There are numerous kernel-level packet screens, including ipf, ipfw, and ipfwadm. Typically, these are included in various free Unix implementations, such as FreeBSD , OpenBSD , NetBSD , and Linux . You might also find these tools available in your commercial Unix implementation. If you're willing to get your hands a little dirty, it's completely possible to build a secure and fully functional firewall for the price of hardware and some of your time.
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