How to Configure Bridged Networking for KVM on Ubuntu 16.04 / 14.04 / Debian 9

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Bridged networking or network is a dedicated network card to a virtual machine which provides a communication path to outside network, and this must be set up before creating a virtual machine using Virtual Manager.

READ: How to install KVM on Ubuntu 16.04 / Ubuntu 14.04

This guide will help you to configure bridged networking on Ubuntu 16.04 / Ubuntu 14.04.

You can either use a command line or graphical mode.

Install bridge-utils package using the apt command.

sudo apt-get install -y bridge-utils resolvconf

Command line

Edit interface file to create bridge “br1“, this should be executed on KVM host.

sudo nano /etc/network/interfaces

My machine has two network cards eth0 and eth1, so I have created a bridge using both network card.

# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback

#Bridge  Name #
auto br1

# Bridge Information #
iface br1 inet static
bridge_ports eth1 eth0
bridge_stp off
bridge_fd 9
# Bride IP #
address 192.168.12.7
netmask 255.255.255.0
network 192.168.12.0
broadcast 192.168.12.255
gateway 192.168.12.2
dns-nameservers 192.168.12.2
dns-nameservers 8.8.8.8

Bring up the bridge.

sudo ifup br1

OR

Restart the network service.

sudo service networking restart

Graphical Mode

Click on the dash and search for Virtual Machine Manager.

Configure bridged networking for KVM on Ubuntu 16.04 - Virt Manager
Configure bridged networking for KVM on Ubuntu 16.04 – Virt Manager

or

virt-manager

Edit >> Connection details >> Click on Plus sign.

Configure bridged networking for KVM on Ubuntu 16.04 - Bridged Networking Connection Details
Configure bridged networking for KVM on Ubuntu 16.04 – Bridged Networking Connection Details

Choose bridge as an interface type and then click on forward.

Configure bridged networking for KVM on Ubuntu 16.04 - Bridged Networking Interface type
Configure bridged networking for KVM on Ubuntu 16.04 – Bridged Networking Interface type

Set a Name, start mode as on boot and choose to activate now.

Configure bridged networking for KVM on Ubuntu 16.04 - Bridged Networking Configure Interface
Configure bridged networking for KVM on Ubuntu 16.04 – Bridged Networking Configure Interface

You can configure ip address by clicking on Configure right to IP settings.  Once IP is configured, click OK.

Configure bridged networking for KVM on Ubuntu 16.04 - Bridged Networking Configure IP for bridge
Configure bridged networking for KVM on Ubuntu 16.04 – Bridged Networking Configure IP for bridge

Clik on the finish to create a bridge called “br1”.

Configure bridged networking for KVM on Ubuntu 16.04 - Bridged Networking
Configure bridged networking for KVM on Ubuntu 16.04 – Bridged Networking

Verify ip address by using the following command.

ifconfig br1

Output:

br1       Link encap:Ethernet  HWaddr 00:0c:29:26:55:17
          inet addr:192.168.12.7  Bcast:192.168.12.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe26:5517/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:250 errors:0 dropped:0 overruns:0 frame:0
          TX packets:229 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:21236 (21.2 KB)  TX bytes:31676 (31.6 KB)
Configure bridged networking for KVM on Ubuntu 16.04 - Bridged Networking Verifying details
Configure bridged networking for KVM on Ubuntu 16.04 – Bridged Networking Verifying details

That’s All.

Further Reading

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