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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">
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 <TITLE>Firewall e contabilidade de pacotes: Filtragem de pacotes</TITLE>
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 <LINK HREF="firewall-1.html" REL=previous>
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<H2><A NAME="s2">2. Filtragem de pacotes</A></H2>

<P>A filtragem de pacotes faz com que o seu computador aceite ou descarte
pacotes IP baseado no seguinte crit&eacute;rio:
<P>
<UL>
<LI>Origem</LI>
<LI>Destino</LI>
<LI>Interface de recebimento</LI>
</UL>
<P>Origem e destino s&atilde;o qualificados por:
<P>
<UL>
<LI>N&uacute;mero IP</LI>
<LI>N&uacute;mero da porta</LI>
<LI>Protocolo</LI>
</UL>
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