[  512.772730] bond0: (slave eth0): making interface the new active one
[  512.772795] bond0: (slave eth0): Enslaving as an active interface with an up link
[  517.020372] bond0: (slave eth0): Releasing backup interface
[  517.132783] bond0: (slave eth0): Enslaving as an active interface with an up link
[  521.305039] bond0: (slave eth0): Releasing backup interface