Not permitted to add eth0 to bond0

Question

I'm trying to add an interface to my bond0 but I always get the error.

   sudo ip link set dev eth0 master bond0
  RTNETLINK answers: Operation not permitted

I already tried it with sudo and with the root user neither worked. Is my command wrong. I got it from here:
https://github.com/ebiken/doc-network/wiki/Linux-iproute2-:-ip-link-bridge-operations

Solution

As was said in comment, try first make eth0 interface down and then add to the bond0. It helped in my case:

sudo ip link set dev eth0 down
sudo ip link set dev eth0 master bond0

Comments

[duanev]

some kernels appear to require the slave device to be down before it can be bound