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Context English Portuguese (Brazil) State
<personname><firstname>Alex</firstname><surname>Dupre</surname></personname><affiliation> <_:address-1/> </affiliation>
<personname><firstname>Alex</firstname><surname>Dupre</surname></personname><affiliation> <_:address-1/> </affiliation>
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Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this document, and the FreeBSD Project was aware of the trademark claim, the designations have been followed by the <quote>™</quote> or the <quote>®</quote> symbol.
$FreeBSD: head/en_US.ISO8859-1/articles/filtering-bridges/article.xml 53717 2019-12-29 14:13:50Z carlavilla $
$FreeBSD: head/en_US.ISO8859-1/articles/filtering-bridges/article.xml 53717 2019-12-29 14:13:50Z carlavilla $
Often it is useful to divide one physical network (like an Ethernet) into two separate segments without having to create subnets, and use a router to link them together. The device that connects the two networks in this way is called a bridge. A FreeBSD system with two network interfaces is enough in order to act as a bridge.
Geralmente, é útil dividir uma rede física (como uma Ethernet) em dois segmentos separados, sem precisar criar sub-redes, e usar um roteador para vinculá-los. O dispositivo que conecta as duas redes dessa maneira é chamado de ponte (bridge). Um sistema FreeBSD com duas interfaces de rede é suficiente para atuar como uma ponte.
A bridge works by scanning the addresses of <acronym>MAC</acronym> level (Ethernet addresses) of the devices connected to each of its network interfaces and then forwarding the traffic between the two networks only if the source and the destination are on different segments. Under many points of view a bridge is similar to an Ethernet switch with only two ports.
Uma ponte funciona examinando os endereços do nível <acronym>MAC</acronym> (endereços Ethernet) dos dispositivos conectados a cada uma de suas interfaces de rede e encaminhando o tráfego entre as duas redes apenas se a origem e o destino estiverem em diferentes segmentos. Sob muitos pontos de vista, uma ponte é semelhante a um switch Ethernet com apenas duas portas.
Why use a filtering bridge?
Por que usar uma ponte de filtragem?
More and more frequently, thanks to the lowering costs of broad band Internet connections (xDSL) and also because of the reduction of available IPv4 addresses, many companies are connected to the Internet 24 hours on 24 and with few (sometimes not even a power of 2) IP addresses. In these situations it is often desirable to have a firewall that filters incoming and outgoing traffic from and towards Internet, but a packet filtering solution based on router may not be applicable, either due to subnetting issues, the router is owned by the connectivity supplier (<acronym>ISP</acronym>), or because it does not support such functionalities. In these scenarios the use of a filtering bridge is highly advised.
Cada vez mais frequentemente, graças aos custos reduzidos de conexões de banda larga à Internet (xDSL) e também devido à redução de endereços IPv4 disponíveis, muitas empresas estão conectadas à Internet 24 horas por dia e com poucos (às vezes nem mesmo 2) endereços IP. Nestas situações, geralmente é desejável ter um firewall que filtre o tráfego de entrada e de saída de e para a Internet, mas uma solução de filtragem de pacotes baseada em roteador pode não ser aplicável, quer seja devido a problemas de sub-redes, quer seja porque o roteador é de propriedade do provedor de conectividade (<acronym>ISP</acronym>), ou porque ele não suporta tais funcionalidades. Nestes cenários, o uso de uma ponte de filtragem é altamente recomendado.
A bridge-based firewall can be configured and inserted between the xDSL router and your Ethernet hub/switch without any IP numbering issues.
Um firewall baseado em uma ponte de filtragem pode ser configurado e inserido entre o roteador xDSL e seu hub/switch Ethernet sem causar nenhum problema de numeração IP.

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$FreeBSD: head/pt_BRen_US.ISO8859-1/articles/filtering-bridges/pt_BR.po 52261 2018-09-16 01:21:25Z ebrandiarticle.xml 53717 2019-12-29 14:13:50Z carlavilla $
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