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sshandncyou are using, but on Ubuntu, comments are allowed in.ssh/configonly on their own line, andnc -Gisn't; it'snc -w.nmcli d show|grep,ip -o addretc, they are much faster; for virtual network ping maybe more preferable since it support specifying outgoing interfaceping -I docker0 172.17.0.1which fails instantly if the interface is not up.