Regras para o access point

$ sudo iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
$ sudo iptables -A FORWARD -i eth0 -o wlan0 -m state --state RELATED,ESTABLISHED -j ACCEPT
$ sudo iptables -A FORWARD -i wlan0 -o eth0 -j ACCEPT

Regras para o postgres

$ sudo iptables -A INPUT -p tcp -s 0/0 --sport 1024:65535 -d 192.168.42.1  --dport 5432 -m state --state NEW,ESTABLISHED -j ACCEPT
$ sudo iptables -A OUTPUT -p tcp -s 192.168.42.1 --sport 5432 -d 0/0 --dport 1024:65535 -m state --state ESTABLISHED -j ACCEPT

Verificando

$ sudo iptables -t nat -S
$ sudo iptables -S

Salvando

$ sudo sh -c "iptables-save > /etc/iptables.ipv4.nat"

Configuração da interface

  1. Editar o arquivo interfaces

     $ sudo ifdown wlan0
 $ sudo cp /etc/network/interfaces /etc/network/interfaces.backup
 $ sudo nano /etc/network/interfaces

  2. Adiconar a linha abaixo no final do arquivo

     up iptables-restore < /etc/iptables.ipv4.nat

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