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iscsiadm: cannot make connection to <IP>: No route to host

Posted on 2015-01-06
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Last Modified: 2015-01-06
I'm new to iSCSI configuration and may have missed something in configuration.  I have a target and initiator configured as follows:

target has single interface with IP  10.10.12.16
initiator has single interface with IP  10.10.12.20

[root@target ~]# targetcli ls
o- / ......................................................................................................................... [...]
  o- backstores .............................................................................................................. [...]
  | o- block .................................................................................................. [Storage Objects: 0]
  | o- fileio ................................................................................................. [Storage Objects: 1]
  | | o- disk01 .......................................................... [/iscsi_disks/disk01.img (880.0GiB) write-back activated]
  | o- pscsi .................................................................................................. [Storage Objects: 0]
  | o- ramdisk ................................................................................................ [Storage Objects: 0]
  o- iscsi ............................................................................................................ [Targets: 1]
  | o- iqn.2014-12.com.test:iscsi.target00 ..................................................................... [TPGs: 1]
  |   o- tpg1 ............................................................................................... [no-gen-acls, no-auth]
  |     o- acls .......................................................................................................... [ACLs: 1]
  |     | o- iqn.2014-12.com.test:iscsi ................................................................. [Mapped LUNs: 1]
  |     |   o- mapped_lun0 ............................................................................... [lun0 fileio/disk01 (rw)]
  |     o- luns .......................................................................................................... [LUNs: 1]
  |     | o- lun0 ........................................................................ [fileio/disk01 (/iscsi_disks/disk01.img)]
  |     o- portals .................................................................................................... [Portals: 1]
  |       o- 10.10.12.16:3260 ................................................................................................. [OK]
  o- loopback ......................................................................................................... [Targets: 0]

[root@target ~]# cat /etc/iscsi/initiatorname.iscsi
10.10.12.16:3260,1 iqn.2014-12.com.test:iscsi.target00

[root@target ~]# netstat -lnp | grep 3260
tcp        0      0 10.10.12.16:3260        0.0.0.0:*               LISTEN      -

[root@target ~]# iscsiadm -m node iqn.2014-12.com.test:iscsi.target00 -p 10.10.12.16
# BEGIN RECORD 6.2.0.873-21
node.name = iqn.2014-12.com.test:iscsi.target00
node.tpgt = 1
node.startup = automatic
node.leading_login = No
iface.hwaddress = <empty>
iface.ipaddress = <empty>
iface.iscsi_ifacename = default
iface.net_ifacename = <empty>
iface.transport_name = tcp
iface.initiatorname = <empty>
iface.state = <empty>
iface.vlan_id = 0
iface.vlan_priority = 0
iface.vlan_state = <empty>
iface.iface_num = 0
iface.mtu = 0
iface.port = 0
iface.bootproto = <empty>
iface.subnet_mask = <empty>
iface.gateway = <empty>
iface.dhcp_alt_client_id_state = <empty>
iface.dhcp_alt_client_id = <empty>
iface.dhcp_dns = <empty>
iface.dhcp_learn_iqn = <empty>
iface.dhcp_req_vendor_id_state = <empty>
iface.dhcp_vendor_id_state = <empty>
iface.dhcp_vendor_id = <empty>
iface.dhcp_slp_da = <empty>
iface.fragmentation = <empty>
iface.gratuitous_arp = <empty>
iface.incoming_forwarding = <empty>
iface.tos_state = <empty>
iface.tos = 0
iface.ttl = 0
iface.delayed_ack = <empty>
iface.tcp_nagle = <empty>
iface.tcp_wsf_state = <empty>
iface.tcp_wsf = 0
iface.tcp_timer_scale = 0
iface.tcp_timestamp = <empty>
iface.redirect = <empty>
iface.def_task_mgmt_timeout = 0
iface.header_digest = <empty>
iface.data_digest = <empty>
iface.immediate_data = <empty>
iface.initial_r2t = <empty>
iface.data_seq_inorder = <empty>
iface.data_pdu_inorder = <empty>
iface.erl = 0
iface.max_receive_data_len = 0
iface.first_burst_len = 0
iface.max_outstanding_r2t = 0
iface.max_burst_len = 0
iface.chap_auth = <empty>
iface.bidi_chap = <empty>
iface.strict_login_compliance = <empty>
iface.discovery_auth = <empty>
iface.discovery_logout = <empty>
node.discovery_address = 10.10.12.16
node.discovery_port = 3260
node.discovery_type = send_targets
node.session.initial_cmdsn = 0
node.session.initial_login_retry_max = 8
node.session.xmit_thread_priority = -20
node.session.cmds_max = 128
node.session.queue_depth = 32
node.session.nr_sessions = 1
node.session.auth.authmethod = None
node.session.auth.username = <empty>
node.session.auth.password = <empty>
node.session.auth.username_in = <empty>
node.session.auth.password_in = <empty>
node.session.timeo.replacement_timeout = 120
node.session.err_timeo.abort_timeout = 15
node.session.err_timeo.lu_reset_timeout = 30
node.session.err_timeo.tgt_reset_timeout = 30
node.session.err_timeo.host_reset_timeout = 60
node.session.iscsi.FastAbort = Yes
node.session.iscsi.InitialR2T = No
node.session.iscsi.ImmediateData = Yes
node.session.iscsi.FirstBurstLength = 262144
node.session.iscsi.MaxBurstLength = 16776192
node.session.iscsi.DefaultTime2Retain = 0
node.session.iscsi.DefaultTime2Wait = 2
node.session.iscsi.MaxConnections = 1
node.session.iscsi.MaxOutstandingR2T = 1
node.session.iscsi.ERL = 0
node.conn[0].address = 10.10.12.16
node.conn[0].port = 3260
node.conn[0].startup = manual
node.conn[0].tcp.window_size = 524288
node.conn[0].tcp.type_of_service = 0
node.conn[0].timeo.logout_timeout = 15
node.conn[0].timeo.login_timeout = 15
node.conn[0].timeo.auth_timeout = 45
node.conn[0].timeo.noop_out_interval = 5
node.conn[0].timeo.noop_out_timeout = 5
node.conn[0].iscsi.MaxXmitDataSegmentLength = 0
node.conn[0].iscsi.MaxRecvDataSegmentLength = 262144
node.conn[0].iscsi.HeaderDigest = None
node.conn[0].iscsi.IFMarker = No
node.conn[0].iscsi.OFMarker = No
# END RECORD


[root@target ~]# iscsiadm -m discovery -t sendtargets -p 10.10.12.16
10.10.12.16:3260,1 iqn.2014-12.com.test:iscsi.target00

[root@initiator ~]# iscsiadm -m discovery -t sendtargets -p 10.10.12.16
iscsiadm: cannot make connection to 10.10.12.16: No route to host

I can ping, ssh etc. from initiator to target.

I have opted not to configure CHAP.

Anyone know what I can do to progress.
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Question by:mickt
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Accepted Solution

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Neil Russell earned 500 total points
ID: 40533144
What is the IP of the initiator?
Is there a firewall between the two? Possible its rejecting port :3260
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Author Comment

by:mickt
ID: 40533159
Yes, damn iptables!

Reconfigured and it's fine.
iptables -D INPUT -j REJECT --reject-with icmp-host-prohibited
iptables -D FORWARD -j REJECT --reject-with icmp-host-prohibited
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LVL 37

Expert Comment

by:Neil Russell
ID: 40533161
Caught me out many a time!
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