Questions[nmcli](ubuntu)

I'm new to nmcli and trying to figure out how to create an eth0 connection. sudo nmcli con prints the following:

NAME       UUID     TYPE      DEVICE
MyWlan0    ...      wifi      wlan0
MyEth0     ...      ethernet  --

No matter what command I give, my MyEth0 connection will not show eth0 under DEVICE above (just '--') and, as a result, I'll get the following error when I try sudo nmcli con up MyEth0:

Error: Connection activation failed: No suitable device found for this connection (device lo not available because device is strictly unmanaged).

This is how I created the connection:

sudo nmcli con add con-name MyEth0 type ethernet ifname eth0

I've also tried modifying it with the following sorts of commands:

sudo nmcli con mod MyEth0 connection.interface-name eth0

Running sudo nmcli con show MyEth0 connection | grep eth0 does indicate that the connection.interface-name is eth0, but it does not appear this way according to the behavior described above.

Any ideas?

Edit:

Here is the output of sudo lshw -C network:

  *-network:0
       description: Ethernet interface
       physical id: 2
       logical name: eth0
       serial: dc:a6:32:27:84:45
       size: 100Mbit/s
       capacity: 1Gbit/s
       capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=bcmgenet driverversion=v2.0 duplex=full link=yes multicast=yes port=MII speed=100Mbit/s
  *-network:1
       description: Wireless interface
       physical id: 3
       logical name: wlan0
       serial: dc:a6:32:27:84:46
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=brcmfmac driverversion=7.45.18 firmware=01-6a2c8ad4 ip=192.168.1.201 multicast=yes wireless=IEEE 802.11

I'm new to Ubuntu Core. On first login I selected the option: Will use DHCP for IPv4

Now I'd like to change my machine to use a static IP to be easier to log in remotely.

I ran sudo console-conf on the machine (over ssh, if relevant). This gives me the option to select Use a static IPv4 configuration, which I do.

This gives me the fields subnet, address, gateway,name servers, andsearch domains`. What should I set for these fields? I would like my IP address to be 192.168.1.101. It is currently 192.168.1.13 from DHCP. My chosen IP address is pretty arbitrary, but I'm going to have a group of computers that I'd like to have the IP addresses 192.168.1.1XX.

I'm used to setting my subnet to 255.255.255.0, but I get the error message: should be in CIDR form (xx.xx.xx.xx/yy). I'm not sure what this means or how to fix it. When I try adding /24 at the end of the subnet, the error message goes away and I get a new error message: '192.168.1.101' is not contained in '255.255.255.0/24'.

Update: Here is a screenshot of the error messages

I'm running a headless device that I want to connect to wifi(it's currently on ethernet), so I'm using nmcli. I scan for connections with the following:

sudo nmcli dev wifi rescan
sudo nmcli dev wifi list

and the WiFi network I want is at 95% strength. So, I connect with:

sudo nmcli dev wifi connect "SSID" password "wifipassword"

and I get the following error:

Error: Connection activation failed: (53) The Wi-Fi network could not be found.

and I've tried copying and pasting from list to ensure I did not mistype the SSID, and it still does not work. It works fine from other devices that use Ubuntu and network-manager, so I know it's not the router.

How can it not find the network when I connect, but find it just fine when scanning, and how do I fix this?

When I try to activate an OpenVPN connection using the network manager command:

nmcli connection up vpn_conn 

I get the following error:

Error: Connection activation failed: Could not find source connection. 

I only get the error when there is no gateway set on the ethernet connection. Does anyone know why?

I added unicast static routes to the vpn server. What is more interesting is if I set a fake gateway/default route on the ethernet connection, something like 127.0.0.1 everything works just fine. It seems as though network manager will not even attempt to create the vpn connection if there is no gateway set.

Is this a bug? Where do I report it? How do I fix it?

I want to get a list of Ethernet and wireless connections from the terminal. Those connections are listed in NetworkManager's GUI and include info like the connection's SSID.

The next step is to delete unwanted connections.