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/etc/network/interfaces
auto lo iface lo inet loopback auto eth0 iface eth0 inet static address 172.29.0.11 netmask 255.255.255.0 auto eth1 iface eth1 inet static address 131.193.35.155 netmask 255.255.255.0 gateway 131.193.35.1
this is not needed on machines that get dhcp settings
/etc/resolv.conf
nameserver 172.29.0.1
ping google.com