[Howto] Share Ethernet Via Wifi With NetworkManager In KDE

[Jacalyn Loston]

I have a server without access to the Internet but every now and then I need to update some of its packages. In order to make my life easier, I am using my laptop which is also running Linux to share the laptop's WiFi connection over the Ethernet interface of the laptop and connect the server to the laptop with normal Ethernet cable. Of course, I am also changing the GW on the server to match the IP address of the Ethernet interface of my laptop.


I would like to share the host's internet connection with the client machine. I have read online, and I found out the best way to do this is by opening Network Manager's GUI on my host machine, editing my Ethernet connection and setting the IPv4 settings to "Shared to other computers".



[Howto] Share Ethernet via Wifi with NetworkManager in KDE

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There are many tutorials out there explaining how to achieve this, with different degrees of difficulty. NetworkManager hides all this complexity and provides a shared mode that makes this configuration quick and convenient.


10.42.0.1/24 is the default address set by NetworkManager for a device in shared mode. Addresses in this range are also distributed via DHCP to other computers. If the range conflicts with other private networks in your environment, change it by modifying the ipv4.addresses property:


Will this command support simultaneous AP+STA? In other words, if I am already connected to the Internet via WiFi, will this command create an AP which will allow me to share my WiFi Internet connection with other devices?


The basic situation is rather common: you have one single network connection, and want to share it to other people or devices via wifi. If you want to do that manually you have to set up the wifi network on your own, including encryption, need to bring up a dhcp server, configure the routing and NATing, and so on. That can take quite some time, and is nothing you want to do during some precious training hours.


Thus I simply tried to bring up a shared wifi via the NetworkManager applet in KDE:



After providing a SSID name and configuring some security credentials the process was already done, and I was notified that the network was set up and ready. It was also shown in the plasma applet besides the ethernet connection:






I get internet from my landlord wifi via dhcp. 192.168.1.1 gives me the connection.

I've got a mac mini connecting to this network, get a 192.168.1.X IP address on the wireless interface and then the macos internet sharing is doing the rest so I have full connectivity on the ethernet 192.168.2.1 form the mini which deal with dhcp and routing on 192.168.2.0/24. Also have an AP (192.168.2.2) giving my personal wifi access for phones/tablet access to internet and local NAS routing etc...


Dont need to do all that.

Just hookup Pi with WiFi like you normaly do.

Enable IP-forwarding in the kernel.

And add persistent MASQUERADE rule with iptables.

IP-forwarding and masquerading can be nicked from below Raspi doc though its the other way around with devices on WiFi getting routed to ethernet:






I have Ubuntu 12.04 on a HP 430 notebook and this has a single wired internet connection and I would like to share this with a LG Optimus One with Android 2.3.3. I followed these instructions and created a hotspot as shown below, but UbuntuHost is not visible on the LG Optimus One when I enable the Wifi on it.


Since a couple of Ubuntu versions ago, there is no need for using masquerading techniques through terminal commands to share the internet connection. There isn't even the need to use iwconfig and echo commands to forward stuff. For the many computers and laptops I have tested (Almost 1000 with Ubuntu) I can frankly say for sure that with the following steps you can share your internet connection with no trouble at all.


Step 4 - For cases where you will share internet with somebody close to you on the same room, I normally just share the device with no security. Easier for them to connect. Of course do not do this in a party or in an office full of wireless vampires.


So do not be discourage about looking to get your Ad-Hoc working on your phone. Trust me, it is easy. I hope I have shed some light with this to help you share quicker and easier and to understand when in some cases they do not find ad-hoc devices.


I have this same problem with my computer. The cause for me is that my wifi card doesn't support adhoc mode. You can find out more about your problem by setting up the adhoc network using the commandline. Here are instructions:


I mainly use wireless around my house and like to use one computer to share it's wireless to another when installing Arch, until I can get KDE and networkmanager installed so I can easily connect to the wireless. I've always been able to easily share internet connections with Ubuntu, but when I try it with Arch, with Gnome OR KDE (and their respective applets), It just doesn't work.


I have Ubuntu (Armbian) running on an Orange Pi, and I'm using NetworkManager's internet connection sharing to share a wifi connection with an attached wired ethernet device. (The "wired connection" in NetworkManager has its IPv4 configured to Shared.) This works fine for basic internet sharing, but the wifi network I'm connected to has IPv6 enabled, and I'd like to pass that connectivity along to the wired device. How can I do that?


Starting with that version, the below workaround becomes only relevant to connections that are shared to more interfaces than the router provides in a single prefix (one should always work, typical routers seem to cater for four subnets).


I have two desktop PCs I use frequently, both running Ubuntu 12.04. One is connected to the internet via wireless, and the other has no wireless card. Is there any way I can share my internet connection across the ethernet ports?


I am trying to share my wireless connection with my XBox 360 (which does not have a wireless adapter) via ethernet cable. I thought there once was a sharing option in Network Manager (it has been some time since I've last used Ubuntu) but it appears to be conveniently removed. I've looked and looked across endless results in Google on the subject and they all seem to point to using this missing option.


Is it possible to share internet connection from my laptop which is connected to internet through wlan0 interface (wireless) to other PCs on the LAN with my eth0 interface and lan cable?

(Like, Internet >> wireless Access-point >> laptop (wlan0) >> bridge to eth0 (lan card on this laptop) >> switch (through wired connection) >> other PCs)

and where can I find how?


I followed this link to share my mobile hotspot to my windows desktop using raspberry pi 3 with network manager. Once the setup is complete, I noticed a poor internet connection in comparative when using a usb tethered internet from my mobile... Can anyone help me understand why and how can I resolve it?


If you create a "shared network", it just creates an access point but doesn't share an *existing internet connection.* I already tried connecting to this shared network and the main wifi network at the same time, but you can't do that either.


With this setup, if a secondary ethernet connection is established with an existing internet connection, everything downstream from the Raspberry Pi will see the same it would if it were an actual router serving this network. Downstream devices have their own subnet plus a route to the internet and can see each other between WiFi and Ethernet.


Doing this in older versions of GNOME and NetworkManager was fairly easy. Newer versions can be a bit more challenging. To get started, I generally like to name my ethernet connections with something I can remember. In this example, I have a USB ethernet adapter that I want to use for sharing a wireless connection. Opening the Network panel in GNOME 3 gives me this:


Please note that Wifi is an extensive security-vector and a problem of itself. Besides that: When you want to share a connection you should use a dedicated device, perhaps something with LibreCMC? Other possibilities found also: OpenWRT, DD-WRT etc.


I don't need a lecture. I'm poor and wifi is all I can get right now. There is no need for a dedicated device, and I don't have access to another device. I've shared Internet between this laptop and a desktop before. What you are suggesting is a complication.




This file sets up a simple WiFi connection to a network named My Awesome WiFi Ssid with a WiFi password (psk) of super_secret_wifi_password. If you want to add multiple different WiFi credentials, then simply make a copy of resin-wifi or balena-sample.ignore and change the SSID and psk key values. You can also add the autoconnect-priority integer values in each file to define the priority of each connection when the device has multiple WiFi connections it can connect to.


The connection file also defines what kind of security the network expects. If you want to set up a network with more elaborate security requirements, checkout the NetworkManager settings reference page. If you want to connect to an unsecured WiFi network, simply remove the [wifi-security] section.


By default, when an interface is shared, NetworkManager uses 10.42.x.0/24 as the ipv4 subnet for the interface. This can be set manually by specifying the address1 parameter manner within the [ipv4] block and specifying one address; for example: address1=192.168.1.1. Read more


Note: The python-networkmanager Debian package depends on NetworkManager. Preferably python-networkmanager should be installed with pip instead of apt-get. That will avoid the issue described in the warning above and additionally the application container size will be kept minimal. It is most straightforward to use our Python base images, since they provide pip support out of the box: RUN pip install python-networkmanager.

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