Not sure how this is supposed to work. Found as part of OpenStack testing, but I don't think it's relevant:
[root@lgdrm1110 cinder]# ping6 fd00:206:553::7 PING fd00:206:553::7(fd00:206:553::7) 56 data bytes 64 bytes from fd00:206:553::7: icmp_seq=1 ttl=64 time=0.213 ms 64 bytes from fd00:206:553::7: icmp_seq=2 ttl=64 time=0.129 ms 64 bytes from fd00:206:553::7: icmp_seq=3 ttl=64 time=0.122 ms 64 bytes from fd00:206:553::7: icmp_seq=4 ttl=64 time=0.123 ms ^C --- fd00:206:553::7 ping statistics --- 4 packets transmitted, 4 received, 0% packet loss, time 2999ms rtt min/avg/max/mdev = 0.122/0.146/0.213/0.041 ms [root@lgdrm1110 cinder]# less /var/log/cinder/volume.log [root@lgdrm1110 cinder]# iscsiadm -m discovery -t sendtargets -p fd00:206:553::7:3260 iscsiadm: cannot make connection to fd00:206:553::7:3260: No route to host iscsiadm: cannot make connection to fd00:206:553::7:3260: No route to host ^Ciscsiadm: caught SIGINT, exiting... [root@lgdrm1110 cinder]# iscsiadm -m discovery -t sendtargets -p fd00:206:553::7 [fd00:206:553::3]:3260,1 iqn.2008-05.com.xtremio:001e679fa196 [fd00:205:553::3]:3260,1 iqn.2008-05.com.xtremio:001e679fa196 [fd00:206:553::4]:3260,1 iqn.2008-05.com.xtremio:001e679fa197 [fd00:205:553::4]:3260,1 iqn.2008-05.com.xtremio:001e679fa197 [fd00:206:553::7]:3260,1 iqn.2008-05.com.xtremio:001e679fb5f6 [fd00:205:553::7]:3260,1 iqn.2008-05.com.xtremio:001e679fb5f6 [fd00:206:553::8]:3260,1 iqn.2008-05.com.xtremio:001e679fb5f7 [fd00:205:553::8]:3260,1 iqn.2008-05.com.xtremio:001e679fb5f7 I think the use of -p <IP>:<port> is correct, but surely might fail in case of IPv6. With debug level: [root@lgdrm1110 cinder]# iscsiadm -d 8 -m discovery -t sendtargets -p fd00:206:553::7:3260 iscsiadm: ip fd00:206:553::7:3260, port -1, tgpt -1 iscsiadm: Max file limits 1024 4096 iscsiadm: updating defaults from '/etc/iscsi/iscsid.conf' iscsiadm: updated 'discovery.sendtargets.iscsi.MaxRecvDataSegmentLength', '32768' => '32768' iscsiadm: updated 'node.startup', 'manual' => 'automatic' iscsiadm: updated 'node.leading_login', 'No' => 'No' iscsiadm: updated 'node.session.timeo.replacement_timeout', '120' => '15' iscsiadm: updated 'node.conn[0].timeo.login_timeout', '30' => '15' iscsiadm: updated 'node.conn[0].timeo.logout_timeout', '15' => '15' iscsiadm: updated 'node.conn[0].timeo.noop_out_interval', '5' => '5' iscsiadm: updated 'node.conn[0].timeo.noop_out_timeout', '5' => '5' iscsiadm: updated 'node.session.err_timeo.abort_timeout', '15' => '15' iscsiadm: updated 'node.session.err_timeo.lu_reset_timeout', '30' => '30' iscsiadm: updated 'node.session.err_timeo.tgt_reset_timeout', '30' => '30' iscsiadm: updated 'node.session.initial_login_retry_max', '4' => '8' iscsiadm: updated 'node.session.cmds_max', '128' => '128' iscsiadm: updated 'node.session.queue_depth', '32' => '32' iscsiadm: updated 'node.session.xmit_thread_priority', '-20' => '-20' iscsiadm: updated 'node.session.iscsi.InitialR2T', 'No' => 'No' iscsiadm: updated 'node.session.iscsi.ImmediateData', 'Yes' => 'Yes' iscsiadm: updated 'node.session.iscsi.FirstBurstLength', '262144' => '262144' iscsiadm: updated 'node.session.iscsi.MaxBurstLength', '16776192' => '16776192' iscsiadm: updated 'node.conn[0].iscsi.MaxRecvDataSegmentLength', '262144' => '262144' iscsiadm: updated 'node.conn[0].iscsi.MaxXmitDataSegmentLength', '0' => '0' iscsiadm: updated 'node.conn[0].iscsi.HeaderDigest', 'None' => 'None' iscsiadm: updated 'node.session.nr_sessions', '1' => '1' iscsiadm: updated 'node.session.iscsi.FastAbort', 'Yes' => 'Yes' iscsiadm: Looking for config file /var/lib/iscsi/send_targets/fd00:206:553::7:3260,3260 iscsiadm: Looking for config file /var/lib/iscsi/send_targets/fd00:206:553::7:3260,3260 config st_config. iscsiadm: updated 'discovery.startup', 'manual' => 'manual' iscsiadm: updated 'discovery.type', 'sendtargets' => 'sendtargets' iscsiadm: updated 'discovery.sendtargets.address', '' => 'fd00:206:553::7:3260' iscsiadm: updated 'discovery.sendtargets.port', '0' => '3260' iscsiadm: updated 'discovery.sendtargets.auth.authmethod', 'None' => 'None' iscsiadm: updated 'discovery.sendtargets.timeo.login_timeout', '15' => '15' iscsiadm: updated 'discovery.sendtargets.use_discoveryd', 'No' => 'No' iscsiadm: updated 'discovery.sendtargets.discoveryd_poll_inval', '30' => '30' iscsiadm: updated 'discovery.sendtargets.reopen_max', '5' => '5' iscsiadm: updated 'discovery.sendtargets.timeo.auth_timeout', '45' => '45' iscsiadm: updated 'discovery.sendtargets.timeo.active_timeout', '30' => '30' iscsiadm: updated 'discovery.sendtargets.iscsi.MaxRecvDataSegmentLength', '32768' => '32768' iscsiadm: disc rec already exists iscsiadm: Looking for config file /var/lib/iscsi/send_targets/fd00:206:553::7:3260,3260 iscsiadm: starting sendtargets discovery, address fd00:206:553::7:3260:3260, iscsiadm: in read_transports iscsiadm: Adding new transport tcp iscsiadm: Matched transport tcp iscsiadm: sysfs_attr_get_value: open '/class/iscsi_transport/tcp'/'handle' iscsiadm: sysfs_attr_get_value: new uncached attribute '/sys/class/iscsi_transport/tcp/handle' iscsiadm: sysfs_attr_get_value: add to cache '/sys/class/iscsi_transport/tcp/handle' iscsiadm: sysfs_attr_get_value: cache '/sys/class/iscsi_transport/tcp/handle' with attribute value '18446744072099758112' iscsiadm: sysfs_attr_get_value: open '/class/iscsi_transport/tcp'/'caps' iscsiadm: sysfs_attr_get_value: new uncached attribute '/sys/class/iscsi_transport/tcp/caps' iscsiadm: sysfs_attr_get_value: add to cache '/sys/class/iscsi_transport/tcp/caps' iscsiadm: sysfs_attr_get_value: cache '/sys/class/iscsi_transport/tcp/caps' with attribute value '0x39' iscsiadm: no authentication configured... iscsiadm: sendtargets discovery to fd00:206:553::7:3260:3260 using isid 0x00023d000000 iscsiadm: resolved fd00:206:553::7:3260 to fd00:206:553::7:3260 iscsiadm: discovery timeouts: login 15, reopen_cnt 6, auth 45. iscsiadm: connecting to fd00:206:553::7:3260:3260 iscsiadm: cannot make connection to fd00:206:553::7:3260: No route to host iscsiadm: discovery session to fd00:206:553::7:3260:3260 sleeping for 1 seconds before next login attempt iscsiadm: connecting to fd00:206:553::7:3260:3260 iscsiadm: cannot make connection to fd00:206:553::7:3260: No route to host iscsiadm: discovery session to fd00:206:553::7:3260:3260 sleeping for 1 seconds before next login attempt iscsiadm: connecting to fd00:206:553::7:3260:3260 iscsiadm: cannot make connection to fd00:206:553::7:3260: No route to host iscsiadm: discovery session to fd00:206:553::7:3260:3260 sleeping for 1 seconds before next login attempt iscsiadm: connecting to fd00:206:553::7:3260:3260 ^Ciscsiadm: caught SIGINT, exiting... 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