/etc/network/intefaces

iface eth1 inet static address 192.168.2.9 netmask 255.255.255.0 gateway 192.168.2.1 dns-nameservers 192.168.2.1 8.8.8.8
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auto eth1 iface eth1 inet dhcp wpa-ssid fooAP wpa-psk foopassword