Sinopse

Site da Web do Projeto docs.freebsd.org/en
Licença da tradução BSD 2-Clause "Simplified" License
Processo de tradução
  • As traduções podem ser efetuadas diretamente.
  • Podem ser efetuadas sugestões de tradução.
  • Só os utilizadores escolhidos podem contribuir.
  • A tradução utiliza ficheiros bilingue.
Máscara de ficheiro documentation/content/*/articles/filtering-bridges/_index.po
Ficheiro de tradução Transferir documentation/content/nb_NO/articles/filtering-bridges/_index.po
Última alteração 6 de Abril de 2021 às 01:08
Último autor Anonymous

Estatísticas de cadeias

Percentagem de cadeias Cadeias hospedadas Percentagem de palavras Palavras hospedadas Percentagem de caracteres Caracteres hospedados
Total 61 2.591 15.287
Traduzido 1% 1 1% 2 1% 20
Precisa de edição 0% 0 0% 0 0% 0
Somente leitura 0% 0 0% 0 0% 0
Verificações falhadas 0% 0 0% 0 0% 0
Cadeias com sugestões 0% 0 0% 0 0% 0
Cadeias não traduzidos 98% 60 99% 2.589 99% 15.267
Últimos 12 meses Anterior

Atividade nos últimos 12 meses

0 alteração 0 alteração 0 alteração 0 alteração 9 alterações 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 0 alteração 3 alterações 0 alteração 0 alteração 0 alteração
Mar Abr Maio Jun Jul Ago Set Out Nov Dez Jan Fev

Números rápidos

2.591
Palavras hospedadas
61
Cadeias hospedadas
1%
Traduzido
0
Colaboradores
e 30 dias anteriores

Tendências dos últimos 30 dias

—
Palavras hospedadas
+100%
—
Cadeias hospedadas
+100%
—
Traduzido
+1%
—
Colaboradores
—
Avatar do utilizador Nenhum

Nova cadeia para traduzir

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

1 nova cadeia a traduzir apareceu na tradução. Há um ano
Avatar do utilizador Nenhum

Atualização de recurso

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

O ficheiro "documentation/content/nb_NO/articles/filtering-bridges/_index.po" foi alterado. Há um ano
Avatar do utilizador Nenhum

Cadeia atualizada no repositório

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

New in FreeBSD 4.0, is the concept of stateful filtering. This is a big improvement for UDP traffic, which typically is a request going out, followed shortly thereafter by a response with the same set of IP addresses and port numbers (but with source and destination reversed, of course). For firewalls that have no statekeeping, there is almost no way to deal with this sort of traffic as a single session. But with a firewall that can "remember" an outgoing UDP packet and, for the next few minutes, allow a response, handling UDP services is trivial. The following example shows how to do it. It is possible to do the same thing with TCP packets. This allows you to avoid some denial of service attacks and other nasty tricks, but it also typically makes your state table grow quickly in size.
 
Há um ano
Avatar do utilizador Nenhum

Novas cadeias para traduzir

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

7 novas cadeias a traduzir apareceram na tradução. Há um ano
Avatar do utilizador Nenhum

Atualização de recurso

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

O ficheiro "documentation/content/nb_NO/articles/filtering-bridges/_index.po" foi alterado. Há um ano
Avatar do utilizador Nenhum

Cadeia atualizada no repositório

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

There are two rules for passing SMTP and DNS traffic towards the mail server and the name server, if you have them. Obviously the whole rule set should be flavored to personal taste, this is only a specific example (rule format is described accurately in the man:ipfw[8] man page). Note that for "relay" and "ns" to work, name service lookups must work _before_ the bridge is enabled. This is an example of making sure that you set the IP on the correct network card. Alternatively it is possible to specify the IP address instead of the host name (required if the machine is IP-less).
 
Há um ano
Avatar do utilizador Nenhum

Cadeia atualizada no repositório

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

Now it is time to create your own file with custom firewall rules, to secure the inside network. There will be some complication in doing this because not all of the firewall functionalities are available on bridged packets. Furthermore, there is a difference between the packets that are in the process of being forwarded and packets that are being received by the local machine. In general, incoming packets are run through the firewall only once, not twice as is normally the case; in fact they are filtered only upon receipt, so rules that use `out` or `xmit` will never match. Personally, I use `in via` which is an older syntax, but one that has a sense when you read it. Another limitation is that you are restricted to use only `pass` or `drop` commands for packets filtered by a bridge. Sophisticated things like `divert`, `forward` or `reject` are not available. Such options can still be used, but only on traffic to or from the bridge machine itself (if it has an IP address).
 
Há um ano
Avatar do utilizador Nenhum

Cadeia atualizada no repositório

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

At this point you should be able to insert the machine between two sets of hosts without compromising any communication abilities between them. If so, the next step is to add the `net.link.ether.bridge._[blah]_=_[blah]_` portions of these rows to the [.filename]#/etc/sysctl.conf# file, to have them execute at startup.
 
Há um ano
Avatar do utilizador Nenhum

Cadeia atualizada no repositório

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

There is another important thing to know. When running IP over Ethernet, there are actually two Ethernet protocols in use: one is IP, the other is ARP. ARP does the conversion of the IP address of a host into its Ethernet address (MAC layer). To allow the communication between two hosts separated by the bridge, it is necessary that the bridge will forward ARP packets. Such protocol is not included in the IP layer, since it exists only with IP over Ethernet. The FreeBSD firewall filters exclusively on the IP layer and therefore all non-IP packets (ARP included) will be forwarded without being filtered, even if the firewall is configured to not permit anything.
 
Há um ano
Avatar do utilizador Nenhum

Cadeia atualizada no repositório

Documentation / articles/filtering-bridges/_index — Norueguês (Bokmål)

Before rebooting to load the new kernel or the required modules (according to the previously chosen installation method), you have to make some changes to the [.filename]#/etc/rc.conf# configuration file. The default rule of the firewall is to reject all IP packets. Initially we will set up an `open` firewall, to verify its operation without any issue related to packet filtering (in case you are going to execute this procedure remotely, such configuration will avoid you to remain isolated from the network). Put these lines in [.filename]#/etc/rc.conf#:
 
Há um ano
Explorar todas as alterações de tradução