Linux – How to properly bridge networking between Virtualbox and Ubuntu

linuxnetworkingUbuntuvirtualbox

I've been trying to bridge for a while now, and I'm not sure what's going wrong.

In /etc/network/interfaces, I added the following:

auto br0  
iface br0 inet dhcp
   bridge_ports all

Then, when I try /etc/init.d/networking restart, I can no longer ping anything through eth0. What's going on? I'm not too savy on linux network configuration.

Best Answer

The older (pre v2.0) versions of VirtualBox used to include detailed configuration instructions for configuring the virtual networking. The recent builds automate the process, and the manual cofiguration instructions have been dropped.

You can still download the older versions to access the help files, or you may need to check with the VirtualBox forums to see if the instructions are available elsewhere.

Related Solutions

Virtualbox get network access from host (vista/xp) to guest (ubuntu) – NAT

There are several ways you can approach this:

Don't use a NAT adapter. I realize this may not be possible/desirable, but if you can select "Bridged" adapter and get an IP from that same subnet, all these problems (both gust->host and host->guest) go away.
Use two virtual adapters, the regular NAT one for internet access, and a second "loopback" adapter in bridged mode on your own private subnet. The loopback will be used for communication between the host and guest(s), while the NAT adapter will handle the traffic outside of the host.
There are a number of tricks to do port forwarding to the hosts, as well as open up guests to see the host. By default, I believe, both of these are blocked as to provide a better sandbox. There are plenty of questions here on Server Fault (tagged with VirtualBox) that talk about punching holes as described.

Linux – Issue with multiple bridging for KVM hosts

You have multiple interfaces with addresses on the same subnet with similar netmasks. The odds are a different route is being used for different packets, causing confusion. If you look at the output of

ip route show

You've probably got multiple default gateways as a result. For each set of IPs on the same subnet, give one of them the netmask you have, and the rest a netmask of 255.255.255.255. Those other interfaces will then only be used for packets originating or destined for that address and not others on the subnet.

Best Answer

Related Solutions

Virtualbox get network access from host (vista/xp) to guest (ubuntu) – NAT

Linux – Issue with multiple bridging for KVM hosts

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