Add open-iscsi support on rancher

I wanted to use openebs storage class provisioner on rancher. For this I’m following this link:

There comes a step like: iscsiadm -m discovery -t st -p

I am having hard time finding what IP I have to enter here.
Please help!

ros s enable open-iscsi
ros s up open-iscsi

This is failing for me. Throws http error 404.