Zyxel 326 NAS out of box has iSCSI support, but only with limitations, you have to fill all security parameters and you have to restrict that the lun/volume is only accessible from one iscsi client. This means impossible to connect from two ESXi hypervisor to the same Zyxel 326 nas.
If you install Debian to Zyxel 326 NAS (
http://modernhackers.com/install-debian-linux-into-zyxel-326-nas/ ), you will have the chance to install custom iSCSI setup
Follow to steps to have iSCSI configured for ESXi use on Zyxel 326:
apt-get instal linstall tgt dkms
vi /etc/tgt/conf.d/target01.conf
cat /etc/tgt/conf.d/target01.conf
<target iqn.2019-10.com.modernhackers:server.target01>
backing-store /dev/md0
</target>
service tgt restart
Then after you can configure your ESXi Servers to access the NAS on iSCSI
![](http://modernhackers.com/wp-content/uploads/2019/10/esx-server1-iscsi-connection-940x400.jpg)
![](http://modernhackers.com/wp-content/uploads/2019/10/esx-server1-iscsi-device-940x328.jpg)
tgtadm --mode target --op show
Target 1: iqn.2019-10.com.modernhackers:server.target01
System information:
Driver: iscsi
State: ready
I_T nexus information:
I_T nexus: 1
Initiator: iqn.1998-01.com.vmware:server1-61d7602f alias: none
Connection: 0
IP Address: 192.168.2.21
I_T nexus: 2
Initiator: iqn.1998-01.com.vmware:server2-0a9062f7 alias: none
Connection: 0
IP Address: 192.168.2.22
LUN information:
LUN: 0
Type: controller
SCSI ID: IET 00010000
SCSI SN: beaf10
Size: 0 MB, Block size: 1
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: null
Backing store path: None
Backing store flags:
LUN: 1
Type: disk
SCSI ID: IET 00010001
SCSI SN: beaf11
Size: 1000070 MB, Block size: 512
Online: Yes
Removable media: No
Prevent removal: No
Readonly: No
SWP: No
Thin-provisioning: No
Backing store type: rdwr
Backing store path: /dev/md0
Backing store flags:
Account information:
ACL information:
ALL