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Re: [Xen-users] Xen Networking

  • To: xen-users@xxxxxxxxxxxxx
  • From: Alexandre Kouznetsov <alk@xxxxxxxxxx>
  • Date: Thu, 13 Sep 2012 15:23:32 -0500
  • Delivery-date: Thu, 13 Sep 2012 20:24:50 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


Approach one issue at time. First thing first, get a stable networking configuration on your Dom0.

Read http://wiki.xensource.com/xenwiki/XenNetworking , it has nice pictures.

El 13/09/12 13:46, Vinicius Kwiecien Ruoso escribió:
eth0 is the interface used in the local network (ip:,
eth1 is the interface connected to the internet modem (dhcp)

I have a vpn interface as well (ip:,
configured with tinc.
Forget this one for the moment, shut it down while troubleshooting, if possible. Reduce the variables.

What I want to do is to give the VM the IP,
gw, just like any other machine in the local network.
That seems the right setup.

OK. Now I have an installed windows, but no networking.
It makes sense to me the usage of a bridge with eth0.
Windows is not a guest system I would start with, but should work anyway.

What do you suggest?
#vif     = [ 'mac=00:16:3e:XX:XX:XX,bridge=xenbr0' ]
vif     = [ 'type=ioemu,mac=00:16:3e:XX:XX:XX,bridge=xenbr0' ]

Us the same valid MAC in both cases. Comment out the second line and uncomment the first, when (and if) you install PV drivers.

I've tried those with different configurations in /etc/network/interfaces

auto eth0
iface eth0 inet static

auto xenbr0
iface xenbr0 inet static
  bridge_ports eth0
Don't do that. Do not set up IP address on the eth0 itself AND the bridge, configure only one address once. configure Dom0's address, leave the VM to deal with it's IP address on it's own.

You probably started like this:
auto eth0
iface eth0 inet static

End like this:
#auto eth0
#iface eth0 inet static
#  address
#  netmask
auto xenbr0
iface xenbr0 inet static
  bridge_ports eth0

also didn't work. When I configure the interfaces like this and run
/etc/init.d/networking restart, the eth0 looses it IP address, and
nothing works anymore...
Note, that while you already have VMs running, a "networking restart" is not a good idea: a starting VM will attach it's network interface to a existing bridge, after a "network restart" this on-the-fly configuration will be broken.
If there is no running VM's, "network restart" should be a valid operation.

I am leaving out of this the masquerading setup. It's complete different matter, approach it once your networking is fine.


Alexandre Kouznetsov

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