/etc/iet/initiators.allow is in iscsitarget 1.4.20.3+svn499-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | # The semantics are:
#
# * Without any entries no initiator can see or connect to any target.
#
# * By default we allow all initiators to connect to all targets with
# the "ALL ALL" entry.
#
# * Override which initiators can connect to which targets by putting an
# entry for a given target followed by a comma separated list of
# initiators, either IP address or IQN name (basic regex patterns for
# IQN names are accepted leave out ^ and $ specials as they are implicit),
# separate the two with whitespace.
#
# * Entry processing stops at the "ALL" target entry if present.
#
#
# Some examples
#
#iqn.2001-04.com.example:storage.disk1.sys1.xyz 192.168.0.0/16, .*:mscs1-[1-4]\.example\.com
#iqn.2001-04.com.example:storage.disk1.sys2.xyz [3ffe:302:11:1:211:43ff:fe31:5ae2], [3ffe:505:2:1::]/64, 192.168.22.0/24
#iqn.2001-04.com.example:storage.disk1.sys3.xyz ALL
#iqn.2001-04.com.example:storage.disk1.sys4.xyz 192.168.22.3, iqn\.1998-01\.com\.vmware:.*\.example\.com
# ALL 192.168.0.0/16
ALL ALL
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