Network not working in a QEMU/KVM virtual machine running Arch linux

Question

I have installed Arch Linux in a KVM/QEMU virtual machine using the virt-manager program. However, network inside the VM is not working.

My host system has Ubuntu 18.04 and I am using a Wi-Fi based internet connection on host.

Connection details in virt-manager:

This was there by default.

This was created by me.

Output of ip a:

Answer 1

OK. One image you posted shows that you do have a network adapter configured in QEMU, and another one shows that it appears in the VM's Arch Linux when you enter ip a. However, the interface (here ens5) is not configured in the VM.

Please configure the network in the VM using the excellent Arch Linux page on network configuration here (better than I could explain it!):

Arch Linux Wiki: Network configuration

and report back.

As a quick test, you can try (as root, within the VM):

dhcpcd ens5 

(on other systems you sometimes need to type dhclient ens5 instead) as a temporary initiation of a connection.

If this works, there are several methods of creating a permanent configuration which also works.

Method with netctl:

While being connected (see dhcpcd command aboove):

pacman -S netctl 

to install netctl, in case it isn't already installed. (It might actually be a good idea to upgrade your system using pacman -Syu at some point, perhaps before this command, but it might also make this situation more complicated - choose yourself!)

Then, create a configuration file for your network interface (called ens5 as seen per ip a command):

cp /etc/netctl/examples/ethernet-dhcp /etc/netctl/ens5_dhcp_profile 

Then edit the file as needed (or create it from scratch right away) so that it looks like this:

Interface=ens5 Connection=ethernet IP=dhcp 

Then start netctl and enable this profile for netctl:

systemctl enable netctl systemctl start netctl cd /etc/netconfig netctl enable ens5_dhcp_profile netctl start ens5_dhcp_profile 

And try rebooting to see whether it works.

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