Linux bonding for fault-tolerance under Oracle VM VirtualBox does not seem to function as advertised. In active-backup mode (mode 1), only the current active network device is seen externally. In a typical active-backup set up for fault-tolerance, the system performs MII-based health monitoring of the network interface slaves (eth0, eth1) and assigns them according to bond options and interface availability. The channel bonding interface supports several modes of operation. For more information, please see the Deployment Guide at What is Linux network interface bonding? Simply put, the Linux system provides a kernel driver, which can create a logical network device (bond) using 2 or more Network Interface Controllers (NIC) to accomplish link-aggregation and adapter fault-tolerance.
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