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8–iSCSI Protocol
iSCSI Boot
77 83840-546-00 E
Dynamic iSCSI Boot Configuration
In a dynamic configuration, you only need to specify that the system’s IP address
and target/initiator information are provided by a DHCP server (see IPv4 and IPv6
configurations in
“Configuring the DHCP Server to Support iSCSI Boot” on
page 79 ). For IPv4, with the exception of the initiator iSCSI name, any settings on
the Initiator Parameters, 1st Target Parameters, or 2nd Target Parameters
screens are ignored and do not need to be cleared. For IPv6, with the exception of
the CHAP ID and Secret, any settings on the Initiator Parameters, 1st Target
Parameters, or 2nd Target Parameters screens are ignored and do not need to be
cleared. For information on configuration options, see
Table 8-1 .
If DHCP Option 17 is used, the target information is provided by the DHCP server,
and the initiator iSCSI name is retrieved from the value programmed from the
Initiator Parameters screen. If no value was selected, then the controller defaults
to the name:
iqn.1995-05.com.qlogic.<11.22.33.44.55.66>.iscsiboot
where the string
11.22.33.44.55.66
corresponds to the controller’s MAC
address.
If DHCP option 43 (IPv4 only) is used, then any settings on the Initiator
Parameters, 1st Target Parameters, or 2nd Target Parameters screens are
ignored and do not need to be cleared.
To configure the iSCSI boot parameters using dynamic configuration
1. From the General Parameters menu, set the following:

TCP/IP Parameters via DHCP : Enabled (IPv4)

IP Autoconfiguration : Enabled. (IPv6)

iSCSI Parameters via DHCP : Enabled

CHAP Authentication : As Required
NOTE
When using a DHCP server, the DNS server entries are overwritten by the
values provided by the DHCP server. This occurs even if the locally provided
values are valid and the DHCP server provides no DNS server information.
When the DHCP server provides no DNS server information, both the
primary and secondary DNS server values are set to 0.0.0.0. When the
Windows OS takes over, the Microsoft iSCSI initiator retrieves the iSCSI
Initiator parameters and configures the appropriate registries statically. It will
overwrite whatever is configured. Since the DHCP daemon runs in the
Windows environment as a user process, all TCP/IP parameters have to be
statically configured before the stack comes up in the iSCSI Boot
environment.