Note that nm-tool and nmcli will tell you only whether or not you're connected to local network, i.e. whether or not you're connected to your home wifi/ethernet. It won't tell you whether or not you can reach anything beyond your local network, i.e. internet. – Sergiy Kolodyazhnyy Nov 28 '17 at 3:27

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The network used for this tutorial does not assign IP automatically by using DHCP, we’ll assign everything manually. In this tutorial I assume your Linux device is a Debian or Ubuntu based distribution, it may be useful for other distributions too but some commands may be different, for example when restarting services like Samba. Show network connections of a process - Unix & Linux Stack Otherwise, but that's specific to Linux, you can run the process in an isolated network namespace and use wireshark to monitor the traffic. This will probably be more convenient than reading the strace log: create a test network namespace: ip netns add test create a pair of virtual network interfaces (veth-a … SSH : server unexpectedly closed network connection Jul 23, 2020