iSCSI to a Ceph node with 2 network adapters - how to ?

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	Dear all,

	I am experimenting with Ceph setup. I set up a single node
	(Asus P10S-M WS, Xeon E3-1235 v5, 64 GB RAM, 8x3TB SATA HDDs,
	Ubuntu 18.04 Bionic, Ceph packages from
	http://download.ceph.com/debian-luminous/dists/xenial/
	and iscsi parts built manually per
http://docs.ceph.com/docs/master/rbd/iscsi-target-cli-manual-install/)
	Also i changed 'chooseleaf ... host' into 'chooseleaf ... osd'
	in the CRUSH map to run with single host.

	I have both its Ethernets connected to the same LAN,
	with different IPs in the same subnet
	(like, 192.168.200.230/24 and 192.168.200.231/24)
	mon_host in ceph.conf is set to 192.168.200.230,
	and ceph daemons (mgr, mon, osd) are listening to this IP.

	What I would like to finally achieve, is to provide multipath
	iSCSI access through both these Ethernets to Ceph RBDs,
	and apparently, gwcli does not allow me to add a second
	gateway to the same target. It is going like this :

/iscsi-target> create iqn.2018-06.host.test:test
ok
/iscsi-target> cd iqn.2018-06.host.test:test/gateways
/iscsi-target...test/gateways> create p10s 192.168.200.230 skipchecks=true
OS version/package checks have been bypassed
Adding gateway, sync'ing 0 disk(s) and 0 client(s)
ok
/iscsi-target...test/gateways> create p10s2 192.168.200.231 skipchecks=true
OS version/package checks have been bypassed
Adding gateway, sync'ing 0 disk(s) and 0 client(s)
Failed : Gateway creation failed, gateway(s) unavailable:192.168.200.231(UNKNOWN state)

	host names are defined in /etc/hosts as follows :

192.168.200.230 p10s
192.168.200.231 p10s2

so I suppose that something does not listen on 192.168.200.231, but I don't have an idea what is that thing and how to make it listen there. Or how to achieve this goal (utilization of both Ethernets for iSCSI) in different way. Shoud I aggregate Ethernets into a 'bond' interface with single IP ? Should I build and use 'lrbd' tool instead of 'gwcli' ? Is it acceptable that I run kernel 4.15, not 4.16+ ?
What other directions could you give me on this task ?
Thanks in advance for your replies.
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