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Compartilhar internet com servidor na porta WAN.

Publicado por Matheus (X-warrior) Bratfisch em maio 26, 2009

Boa tarde,

Os ultimos dias passei instalando o servidor e com uns problemas para configurar o mesmo. Eu sabia como configurar a rede para funcionar da seguinte maneira:

MODEM -> (eth0) Servidor (eth1) -> (Porta lan) Router (Portas lan) -> Computadores

Porém não era essa topologia que eu desejava, pois com está eu perdia a porta WAN do meu roteador. Então decidi fazer a seguinte:

MODEM -> (eth0) Servidor (eth1) -> (Porta WAN) Router (Portas LAN) -> Computadores

Inicialmente, deixei meu servidor ligado somente ao modem e testei se o mesmo conseguia pingar a internet. Até o momento tudo ok.

Acessei o arquivo “/etc/network/interfaces” e configurei a eth1 manualmente da seguinte maneira:

auto eth1
iface eth1 inet static
address 192.168.100.254
netmask 255.255.255.0
network 192.168.100.0
broadcast 192.168.100.255

Logo em seguida adicionei as regras de iptables:

sysctl net.ipv4.ip_forward=1
iptables -t nat -A POSTROUTING –out-interface eth0 -j MASQUERADE
iptables -A FORWARD –in-interface eth0 -j ACCEPT

Teoricamente o compartilhamento de internet já devia estar funcionando. Mas não foi isso que aconteceu. Resolvi acessar o meu Roteador pela Lan e configura-lo manualmente da seguinte maneira:

IP Address : 192.168.100.1
Subnet Mask : 255.255.255.0
ISP Gateway Address : 192.168.100.254
Primary DNS Address : 200.247.141.11 (DNS VIRTUA SC)
Secondary DNS Address : 200.247.141.12 (DNS VIRTUA SC)

Salvei as modificações, esperei o mesmo ser reiniciado e pronto. Conexão funcionando.

Eu sei que isso não ficou como um tutorial, ficou um “relato” mas este relato pode lhe ajudar a configurar se você seguir os mesmos passos que eu. Lembre-se também que as regras de iptables devem ser executadas sempre na inicialização do servidor. Saiba mais sobre Executar scripts ao iniciar computador.

Demorei bastante tempo e testei várias configurações para que conseguisse tudo funcionando mas acredito que o meu maior problema foi ter usado a mesma Classe de IPS para a rede interna (atrás do roteador) e a “externa” (comunicação entre o roteador e servidor).

Qualquer problema com Compartilhamento ou coisas do tipo, não hesite em perguntar.

Espero que este artigo seja de grande ajuda,
Matheus

Agradecimentos ao Ubuntu Forum que me deu uma ajuda.

Publicado emAprendendoLinux

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