[  500.485616] bond0: (slave eth0): making interface the new active one
[  500.485728] bond0: (slave eth0): Enslaving as an active interface with an up link
[  504.652533] bond0: (slave eth0): Releasing backup interface
[  504.727395] bond0: (slave eth0): Enslaving as an active interface with an up link
[  508.881363] bond0: (slave eth0): Releasing backup interface