auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual
    bond-master bond0

auto eth1
iface eth1 inet manual
    bond-master bond0

auto bond0
iface bond0 inet static
    # For jumbo frames, change mtu to 9000
    mtu 1500
    address 172.16.20.1
    netmask 255.255.255.0
    network 172.16.20.0
    broadcast 172.16.20.255
    gateway 172.16.20.1
    dns-nameservers 172.16.20.2
    bond-miimon 100 # Specifies the MII link monitoring frequency in milliseconds. This determines how often the link state of each slave is inspected for link failures. 
    bond-downdelay 200 # Specifies the time, in milliseconds, to wait before disabling a slave after a link failure has been detected.
    bond-updelay 200 # Specifies the time, in milliseconds, to wait before enabling a slave after a link recovery has been detected.
    bond-mode 0
    bond-slaves none # we already defined the interfaces above with bond-master