NetApp
Configuration > Protocols > iSCSI : Managing iSCSI : Editing default security settings

Editing default security settings
You can use the Edit Default Security dialog box to edit the default security settings for iSCSI initiators connected to the storage system.
Steps 
1.
From the Home tab, double-click the appropriate storage system.
2.
In the navigation pane, click Configuration > Protocols > iSCSI.
3.
In the Default Security box on the Initiator Security tab, click Edit.
4.
Change the security type.
For CHAP authentication, providing user name, password and confirming of password is mandatory for inbound, but optional for outbound.
5.
Click OK.