NetApp
Vserver : Configuration > Protocols > iSCSI : Configuring iSCSI : Adding the security method for iSCSI initiators
Adding the security method for iSCSI initiators
You can use the Add Initiator Security dialog box to add an initiator and specify the security method that is used to authenticate the initiator.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
Ensure that the left navigation pane displays the Vservers hierarchy.
3.
In the navigation pane,  select the Vserver and click Configuration > Protocols > iSCSI.
4.
In the Initiator Security tab, click Add in the Initiator Security area.
5.
Specify the initiator name and security method to authenticate the initiator.
For CHAP authentication, you must provide the user name and password and confirm your password for inbound settings. For outbound settings, this is optional.
6.
Click OK.
Related reference 
iSCSI window