Editing ISCSI (section)

===Addressing===
iSCSI uses TCP (typically [[TCP and UDP port|TCP ports]] 860 and 3260) for the protocols itself, with higher-level names used to address the objects within the protocol.
Special names refer to both iSCSI initiators and targets. iSCSI provides three name-formats:

; iSCSI Qualified Name (IQN)
: Format: The iSCSI Qualified Name is documented in RFC 3720, with further examples of names in RFC 3721. Briefly, the fields are:

:* literal iqn (iSCSI Qualified Name)
:* date (yyyy-mm) that the naming authority took ownership of the domain
:* reversed domain name of the authority (e.g. org.alpinelinux, com.example, to.yp.cr)
:* Optional ":" prefixing a storage target name specified by the naming authority.

:From the RFC:{{Ref RFC|3720|section=3.2.6.3.1|p=32|quote=Type "iqn." (iSCSI Qualified Name)}}
{|class="wikitable"
! Type !! . !! Date !! . !! Naming Auth !! : !! String defined by ''example.com'' Naming Authority
|-
| iqn || . || 1992-01 || . || com.example || : || storage:diskarrays-sn-a8675309
|-
| iqn || . || 1992-01 || . || com.example
|-
| iqn || . || 1992-01 || . || com.example || : || storage.tape1.sys1.xyz
|-
| iqn || . || 1992-01 || . || com.example || : || storage.disk2.sys1.xyz
|}

; Extended Unique Identifier (EUI)
: Format: eui.{EUI-64 bit address} (e.g. <code>eui.02004567A425678D</code>)
; T11 Network Address Authority (NAA)
: Format: naa.{NAA 64 or 128 bit identifier} (e.g. <code>naa.52004567BA64678D</code>)

IQN format addresses occur most commonly. They are qualified by a date (yyyy-mm) because domain names can expire or be acquired by another entity.

The IEEE Registration authority provides EUI in accordance with the EUI-64 standard. NAA is part OUI which is provided by the IEEE Registration Authority. NAA name formats were added to iSCSI in RFC 3980, to provide compatibility with naming conventions used in [[Fibre Channel]] and [[Serial Attached SCSI]] (SAS) storage technologies.

Usually, an iSCSI participant can be defined by three or four fields: 
# Hostname or IP Address (e.g., "iscsi.example.com")
# Port Number (e.g., 3260)
# iSCSI Name (e.g., the IQN "iqn.2003-01.com.ibm:00.fcd0ab21.shark128")
# An optional [[Challenge-handshake authentication protocol|CHAP]] Secret (e.g., "secretsarefun")