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Lexic
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IP Firewall
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Shows "best" firewalls that filters at low level (IP protocol - layer 2) from those that only filters upper layers (generally TCP layer).
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Non IP Firewall
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Tell if the firewall is "able" to forbid non IP protocols (such as NetBeui, IPX) which gives better security.
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NAT (Network Address Translation)
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Usefull when having local network area using a one-entry internet acces point (such as Cable or DSL), the address translation allows your other PC's of your LAN to simlply acces Internet.
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DHCP
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Some softwares allows DHCP ports and its dynamic control onto your LAN (usefull only if you have a LAN).
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Proxy
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The proxy system allows to give Internet access to your LAN,it's a different process from NAT.
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VPN (Virtual Private Network)
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Fonctionnality allowing to create a private network (virtual) with two (or more) different area using Internet. This protocol use secure functions to crypt the exchanged datas between the areas.
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DNS
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Shows if the software provides a DNS replication on your LAN.
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URL Filtering
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Usefull mainly for parental guidance and for corporations wishing to restrict access to the Web.
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Ext
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With Linux, it's not an external software functionnality but a kernel configuration.
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Comparing
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