ifenslave is a utility for attaching and detaching slave network devices to a bonding device. Bonding is putting multiple physical Ethernet devices into a single logical one, what is often termed as Link aggregation/Trunking/Link bundling. You can attach eth0, for example, to a bonding device bond0 by:

The ifenslave utility belongs to the iputils package.

1. To show information of all the inerfaces:

# ifenslave -a
# ifenslave --all-interfaces 

2. To change the active slave:

# ifenslave -c bond0 eth1
# ifenslave --change-active bond0 eth1 

3. To remove the slave interface from the bonding device:

# ifenslave -d eth1
# ifenslave --detach bond0 eth1

4. To show master interface info:

5. To set the bond device down and automatically release all the slaves:

6. To get the help for the ifenslave:

# ifenslave -h
# ifenslave --help 

7. To get the usage info:

# ifenslave -u
# ifenslave --usage 

8. To set to verbose mode:

# ifenslave -v
# ifenslave --verbose

9. To get the version info:

# ifenslave -V
# ifenslave --version