Bridging my network

worov · 08-12-2017, 01:40 PM

Hi, everyone!

This is my first post here. Before reading this, beware that I'm not a native speaker. I apologize for any error that I may have written in the text below.

I'd like to create a bridging network for a virtual machine. I have never done this before.

My host is Debian 9.1 Stretch (amd64). I have a wired connection on my router. Internet works fine. My guest will be Debian Buster (amd64).

How should I set my network for this?

Here is the situation on my host :

My network hardware :

Code:

lspci | grep Ethernet

Code:

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 10)

My /etc/network/interfaces file :

Code:

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

source /etc/network/interfaces.d/*

# The loopback network interface
auto lo
iface lo inet loopback

The state of my network :

Code:

ip a

Code:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 70:8b:cd:90:34:f8 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.19/24 brd 192.168.1.255 scope global dynamic enp2s0
       valid_lft 85249sec preferred_lft 85249sec
    inet6 fe80::a08c:59dc:9fd3:ec18/64 scope link 
       valid_lft forever preferred_lft forever
3: wlp3s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 42:a3:8a:54:94:6f brd ff:ff:ff:ff:ff:ff

How can I create the bridge? Thank you for your help.

AwesomeMachine · 08-12-2017, 05:45 PM

Bridged networking in a VM means that the VM is given its own IP. NAT networking shares the host IP. If your using virtualbox, you just configure a bridged network under networking.

worov · 08-13-2017, 03:37 AM

Hi, AwesomeMachine! Thank for your answer.

Quote:

If your using virtualbox

Virtualbox is unavailable in Stretch. Don't know why. I will use virt-manager. It serves as a graphical user interface for KVM.

Quote:

you just configure a bridged network under networking.

Can do this using Gnome's Network Manager ? Or is this something to be done in command line ?

AwesomeMachine · 08-13-2017, 05:16 AM

Add this line to /etc/apt/sources.list:

Code:

deb http://download.virtualbox.org/virtualbox/debian stretch contrib

Then add the key:

Code:

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | apt-key add -

Then

Code:

apt-get update && apt-get install virtualbox-5.1

If you want vb kernel modules updated when the kernel changes, install

Code:

apt install dkms

Debian dropped VB from its repos, because VB has no LTS releases. That means perpetual upgrades with no security patches for older versions. This is contrary to the Debian model. But many users will continue to use vb because it's so simple.

worov · 08-13-2017, 06:01 AM

Thank you for the virtualbox repository. I wasn't aware that it existed. Virtualbox is now installed on my system.

Should I create the virtual machine now ? Or should I configure the network first ? Which commands shall I run to configure it ?

AwesomeMachine · 08-13-2017, 07:29 AM

Each virtual machine has its own network settings. So, I would make the virtual machine, and configure networking before booting the install media. The type of networking--NAT vs Bridged--is independent of the guest OS settings.

worov · 08-13-2017, 07:50 AM

OK, so I created the VM, but haven't installed the OS yet. Here are the network settings :

https://img4.hostingpics.net/pics/49769211VM.png

enp2s0 is my Ethernet interface.

Now, how can I setup the bridge on my host OS ?

AwesomeMachine · 08-13-2017, 09:39 AM

That appears correct. I'd go with it.

worov · 08-13-2017, 12:08 PM

Now, about creating the bridge on my host ?