[  512.422208] bond0: (slave eth0): making interface the new active one
[  512.422299] bond0: (slave eth0): Enslaving as an active interface with an up link
[  516.625766] bond0: (slave eth0): Releasing backup interface
[  516.703391] bond0: (slave eth0): Enslaving as an active interface with an up link
[  520.854421] bond0: (slave eth0): Releasing backup interface