Bridge network with Virtualbox

howdy guys,
I've been playing with virtualbox a little bit, and found the blog of a guy who is using a virtualbox vm as a webserver.
he lists these steps:
tunctl -t tap0 -u user
;(where user is the user who runs VirtualBox)
chmod 666 /dev/net/tun
;(or add user running VirtualBox to the 'tun' group, on MDV)
brctl addbr br0
ifconfig eth0 0.0.0.0 promisc
;(where eth0 is the interface to be bridged)
brctl addif br0 eth0
dhclient br0
brctl addif br0 tap0
ifconfig tap0 192.168.1.50 up
;(where 192.168.1.50 is an arbitrary unused
;IP in the same subnet as your local network)
echo 1 > /proc/sys/net/ipv4/conf/tap0/proxy_arp
route add -host 192.168.1.5 dev tap0
;(where 192.168.1.5 is the IP address of the host machine)
arp -Ds 192.168.1.5 eth0 pub
;(where 192.168.1.5 is the IP address of the host machine)
(from http://www.happyassassin.net/2007/02/06 … rtualbox/)
I got brctl from the package "bridge-utils,"
and tunctl from "uml_utilities."
these steps almost work, except I can't use dhclient on br0, and on
the host machine eth0 loses its address.
Can someone give me some hints about how do accomplish this in an arch
way, making use of /etc/conf.d/bridges, and rc.conf, or whatever? thanks.

Hi kant1. First I want to thank you for taking the time to respond and second I apologize for not posting earlier. I have been away from my computer these 2 days.
Now, to answer your questions:
Have you tried running "top" and then running openoffice/xine? Maybe they are using some other program that is getting hung up on the network change?
I don't see anything strange.
Also, did you try rebooting after making these changes?
Yes, more than once
Are you using the same address for the bridge as you are for your regular connection? Or using dhcp for both? (The link I posted uses dhcp, but you may need to specify the address if that's what you do for your regular connection)
Does "ifconfig" show that eth0 (or whatever your regular ethernet connection is) does not have an ip address, but br0 does? Does "brctl show" show that br0 has eth0 attached as an interface?
Here is my ifconfig output. I believe this is how it should be
$ ifconfig
br0 Link encap:Ethernet HWaddr 00:17:31:83:C2:30
inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1307 errors:0 dropped:0 overruns:0 frame:0
TX packets:1394 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1021200 (997.2 Kb) TX bytes:195531 (190.9 Kb)
eth0 Link encap:Ethernet HWaddr 00:17:31:83:C2:30
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:1307 errors:0 dropped:0 overruns:0 frame:0
TX packets:1370 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:1041405 (1016.9 Kb) TX bytes:206215 (201.3 Kb)
Interrupt:18
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:129 errors:0 dropped:0 overruns:0 frame:0
TX packets:129 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:8243 (8.0 Kb) TX bytes:8243 (8.0 Kb)
and this is "brctl show"
$ brctl show
bridge name bridge id STP enabled interfaces
br0 8000.00173183c230 no eth0
and this is my network section in /etc/rc.conf
lo="lo 127.0.0.1"
BRIDGE_INTERFACES=(br0)
bridge_br0=(eth0)
br0="br0 192.168.1.2 netmask 255.255.255.0 broadcast 192.168.1.255"
eth0="eth0 0.0.0.0 promisc"
#eth0="eth0 192.168.1.2 netmask 255.255.255.0 broadcast 192.168.1.255"
INTERFACES=(lo br0 eth0)
# Routes to start at boot-up (in this order)
# Declare each route then list in ROUTES
# - prefix an entry in ROUTES with a ! to disable it
gateway="default gw 192.168.1.1"
ROUTES=(gateway)
I don't know if it has any relevance but I was trying to see what is happening with wireshark. When I try to run soffice I see DNS queries to my ISP about arch.localdomain. These queries have naturally response "not found". arch is my host name.
UPDATE: After posting this i added this line in /etc/hosts.
127.0.0.1 arch.localdomain arch
and now openoffice works again .
But now I have 2 problems less significant
1. Still xine doesn't work. I see a query for eth0.localdomain
2. If I use the "Alt+F2" box in KDE and type i.e. calc it will still query my ISP for calc.localdomain.
Last edited by insane (2007-06-16 14:14:21)

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[SOLVED] No luck with VirtualBox network.

EDIT**********
I have a working Arch Linux VM made with VirtualBox. The network works out of the box but once you reboot and remove live media and load into Arch Linux I cannot get a ping.
I have looked through the Arch Linux VirtualBox wiki and I am either confused or feel I have tried what it asked.
Here is what I did.
For the purpose of this post, I made a new VM and successfully followed the beginner guide again and installed Arch Linux and it starts up no problem without the live iso.
first thing I did was
ping -c 3 www.google.com
unknown host...
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dhcpcd[196]: version 6.7.1 starting
dhcpcd[196]: enp0s3: adding address fe80::ced8:2d68:7409:4427
dhcpcd[196]: no interfaces have a carrier
dhcpcd[196]: forked to background, child pid 208
https://wiki.archlinux.org/index.php/Vi … VirtualBox
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[SOLVED] Josh Braun’s Blog // A Guide to Installing Arch in VirtualBox
http://wideaperture.net/blog/?p=3851
Solved using this code. I did not see anything about this in the Wiki.. so check out Josh Brauns Blog.
# systemctl enable [email protected]
Old Horrible Question... DO NOT READ
I can dual boot Arch from my bios and get wifi access easily.
When I use VirtualBox, it has no problem until I actually log on to Arch Linux without the live iso.
I have did searches and i am just LOST on the VirtualBox Arch wiki.
Edit: I have tried dhcpcd and it was not successful. I will post the exact output later.
I am hoping someone can direct me to get this working.
I have a windows 7 Dell laptop and VirtualBox loads into Arch Linux without the iso as a drive. Just looking for guidance and search terms. Thank you./
Last edited by AcousticBruce (2015-03-12 00:20:43)

That's understandable, I know well myself how intimidating it can be at the very beginning.
I will explain a bit. Those guides are just asking for trouble for two reasons: (1) they are outdated and Arch moves quick. And (2) it will prevent you from learning how to administer your system. You copied and pasted that command but did you know what you were doing? Probably not. I guarantee you will run into that same problem again if you don't know how systemd and services, etc. work in general. The first link to dhcpcd was the section about running the service. Notice it links to the systemd page that explains in general how to start, stop, enable, and disable services. This is the kind of research you will need to do on your own if you hope to get to the point where you don't have to ask questions about every single step. It's okay to ask questions, but when it comes to something as straightforward as enabling a service, people will usually just point you to the links.
If you're only a week into Linux in general and you've successfully installed Arch in a VM, then that's a good sign. The lingo will come in time but you definitely need to do a bit of studying. You should read through the wiki in depth. That is, the beginner's guide isn't just for installing Arch for the first time. It includes tons of links to all the moving parts of your system. The general recommendations page is also a must read.
With effort and patience you'll pick up what you now don't understand at all
EDIT: note also that the exact step that you found on this other guide is listed in the beginner's guide: https://wiki.archlinux.org/index.php/Be … Dynamic_IP
I suspect you got drawn into the VirtualBox wiki page without slowly and carefully going through the beginner's guide as well.
Last edited by nullified (2015-03-12 03:00:59)

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Hi out there.
I'm trying to set up VirtualBox bridged networking as described in the wiki by "the arch way"
Here are the relevant details of my config files:
/etc/conf.d/bridges:
bridge_br0="eth0"
BRIDGE_INTERFACES=(br0)
/etc/vbox/interfaces:
vbox0 nofoo br0
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/etc/rc.conf:
MODULES=(e1000e snd-mixer-oss snd-pcm-oss snd-hwdep snd-page-alloc snd-pcm snd-timer snd snd-hda-intel soundcore bridge vboxdrv vboxnet)
lo="lo 127.0.0.1"
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br0="dhcp"
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After a reboot, myifconfig says:
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inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::221:70ff:fe0b:d711/64 Scope:Link
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RX packets:2001 errors:0 dropped:0 overruns:0 frame:0
TX packets:1561 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
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eth0 Link encap:Ethernet HWaddr 00:21:70:0B:D7:11
inet6 addr: fe80::221:70ff:fe0b:d711/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2039 errors:0 dropped:0 overruns:0 frame:0
TX packets:1569 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:941218 (919.1 Kb) TX bytes:289875 (283.0 Kb)
Memory:fdfc0000-fdfe0000
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
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RX packets:4 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
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Errorcode:
NS_ERROR_FAILURE (0x80004005)
Component:
Console
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IConsole {e3c6d4a1-a935-47ca-b16d-f9e9c496e53e}
Does anyone of you know what went wrong here?
regards
monk

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A (rather poor) ascii picture of what I need:
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192.168.1.100/24 <---->ISP CPE/28 <-------> | |
192.168.2.100/24 <---->ISP CPE/28 <-------> | |
Etc up 'till 192.168.30.100/24 | |
|_________________|
The Internet becomes no more than a 30 port switch - with any 192.168.x.y being able to ping any other 192.168.x.y node
Any takers?

Hello,
Just to make sure I have it correctly, you have several sites each with their own public addresses, which then have a private address range network behind them, and they need to all be able to communicate?
If so the solution would be site-to-site VPN tunnels. That way each client could communicate with every other client using the private addresses, and all of the traffic going out over the ISPs public network would be encrypted. This would involve a lot of tunnels so you would need a pretty beefy router, but that should give you what you are looking for.
Hope I understood it correctly and this helps,
Christopher Ebert - Advanced Network Support Engineer
Cisco Small Business Support Center
*please rate helpful posts*

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Hello all,
I had a dialog here: https://bbs.archlinux.org/viewtopic.php?id=145177 but I inadvertently hijacked the OP thread, for that I deeply apologize and decided to start my own thread.
I've been struggling with getting my bridge networking working with QEMU/KVM. I would love to get my KVM Windows 7 install working with bridge network so I can access my internal lan, but so far I am out of luck. When I follow the Wiki's I completely hose my network settings and can't get online with my Arch host.
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https://wiki.archlinux.org/index.php/QE … al_network
should I be using this wiki instead:
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I have a couple of confusing questions, that I hope someone can answer, or lead me in a direction to help me find a solution. Free internet beer for helping.
From a vanilla install of Arch, if I would like to run Windows 7 64-bit in a VM, should I use QEMU or KVM? I did get the windows 7 up and running, not sure how, but it's not on my internet LAN, the VM can only access the internet.
Can someone help me out step by step or pointing me in a direction that can help get a bridge network set up between my host, which will need a static IP address, and my VM, which I would prefer to have another static IP address on my network.
I've tried using virtualbox but the performance was slower than using QEMU/KVM.
BTW, what's the difference between QEMU and KVM? I'm confused by that as well. I would even be willing to write up a "beginners guide" if I can get help getting mine set up.
any help is greatly appreciated.
--nixIT

I do things manually on my system so, for two VM:
ip tuntap add dev tap0 mode tap user djgera
ip tuntap add dev tap1 mode tap user djgera
brctl addbr br0
brctl setfd br0 0.0
brctl addif br0 eth0
brctl addif br0 tap0
brctl addif br0 tap1
ip link set dev br0 up
ip link set dev tap0 up
ip link set dev tap1 up
ip addr del 192.168.0.77/24 dev eth0
ip addr add 192.168.0.77/24 broadcast + dev br0
ip route add default via 192.168.0.1
then each qemu-kvm instance that I lauch add:
-device virtio-net-pci,netdev=net0,mac=52:54:00:12:34:00 -netdev type=tap,id=net0,ifname=tap0,script=no,downscript=no
-device virtio-net-pci,netdev=net1,mac=52:54:00:12:34:01 -netdev type=tap,id=net1,ifname=tap1,script=no,downscript=no

Tap0.device issues while attempting to start bridged network

i'm trying to get the bridged network working so i can run xen and everytime i try sudo netctl enable xenbridge-dhcp i get this error in journalctl.
-- Logs begin at Wed 2013-05-15 14:16:16 PDT, end at Tue 2013-05-28 18:26:42 PDT. --
May 28 18:25:07 kimbra sudo[23762]: pam_unix(sudo:session): session closed for user root
May 28 18:25:12 kimbra sudo[23764]: jd : TTY=pts/1 ; PWD=/home/jd ; USER=root ; COMMAND=/usr/bin/netctl start xenbridge-dhcp
May 28 18:25:12 kimbra sudo[23764]: pam_unix(sudo:session): session opened for user root by (uid=0)
May 28 18:25:12 kimbra systemd[1]: Expecting device sys-subsystem-net-devices-tap0.device...
-- Subject: Unit sys-subsystem-net-devices-tap0.device has begun with start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/li … temd-devel
-- Unit sys-subsystem-net-devices-tap0.device has begun starting up.
May 28 18:26:42 kimbra systemd[1]: Job sys-subsystem-net-devices-tap0.device/start timed out.
May 28 18:26:42 kimbra systemd[1]: Timed out waiting for device sys-subsystem-net-devices-tap0.device.
-- Subject: Unit sys-subsystem-net-devices-tap0.device has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/li … temd-devel
-- Documentation: http://www.freedesktop.org/wiki/Softwar … e9d022f03d
-- Unit sys-subsystem-net-devices-tap0.device has failed.
-- The result is timeout.
May 28 18:26:42 kimbra systemd[1]: Dependency failed for xen bridge.
-- Subject: Unit netctl@xenbridge\x2ddhcp.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/li … temd-devel
-- Documentation: http://www.freedesktop.org/wiki/Softwar … e9d022f03d
-- Unit netctl@xenbridge\x2ddhcp.service has failed.
-- The result is dependency.
May 28 18:26:42 kimbra sudo[23764]: pam_unix(sudo:session): session closed for user root
tap0.device is not working and i can't find the uml_utilities package anywhere.
help?

Sorry for the rather late response, but I've just been through this issue myself. The tunctl & brctl utilities are now part of 'uml_utliities', which is itself deprecated.
I downloaded uml_utilities and installed it.
I've encountered a bug which appears to be common to all bridged netwroking (the inbuilt VirtualBox bridging demonstrates the same problem). The nature of the bug is that if I bridge with the physical ethernet adapter, only a linux guest VM can see the outside world. THis is true whether the guest is running under VirtualBox or KVM so the issue appears to be generic.
Non-linux guests can see each other and the *host*, but not the rest of the world. Speculations as to the reason include the deprecation of Uml_Utilities, but regardless, I tried something different.
I created the bridge and assigned it a separate subnet. I added some tap interfaces. I ran a DHCP server instance listening on the bridge alone. I set forwarding on, and created a static route enabling my router to find the virtual subnet.
I used dnsmasq for the DHCP as it isn't used by my regular network setup, meaning that I can screw around with it trivially without breaking things. Additionally, I set up the config automatically from my vnet script. I can potentially add multiple virtual subnets this way although I haven't included support in the script as yet. The minimal config hands out addresses from the pool specified on the vnet command line, and I can set up static addresses on the same subnet by referencing the contents of /etc/host and /etc/ethers (it identifies vms by mac address).
This works perfectly, and has the advantage that the virtual network traffic will route via wireless as well as cabled ethernet. It also makes it simple to firewall the virtual subnet and reduces the risk of experiencing minor hassle when my broken vnet code stuffs the ethernet interface.
Ping me if you want a copy of the vnet script, although it's still very much a work in progress.
Last edited by salafrance (2013-09-21 20:02:12)

Bridge network with Virtualbox

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