ifenslave

This is a tool to attach and detach slave network interfaces to a bonding device. A bonding device will act like a normal Ethernet network device to the kernel, but will send out the packets via the slave devices using a simple round-robin scheduler. This allows for simple load-balancing, identical to “channel bonding” or “trunking” techniques used in switches.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.