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Re: [Xen-users] Basic Network Bridge

  • To: xen-users@xxxxxxxxxxxxx
  • From: Alexandre Kouznetsov <alk@xxxxxxxxxx>
  • Date: Thu, 21 Jun 2012 16:44:28 -0500
  • Delivery-date: Thu, 21 Jun 2012 21:45:38 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>


El 21/06/12 16:31, Eric Lindsey escribió:
My /etc/network/interfaces:
iface eth0 inet static

allow-hotplug eth1
iface eth1 inet static
address w.x.y.z
gateway w.x.y.z
There is a general recommendation to create the bridge(s) manually (or using your distribution standard means), not using -network-bridge script. It give a much more predictable result.

As you can see, eth0 is my LAN and eth1 is WAN. The box normally functions as a 
NAT router for everything on eth0 to connect to the Internet via eth1. However 
I have not installed those packages or changed my iptables to provide that 
functionality yet. This is still a bone stock installation of Debian and on 
dom0 I have Internet access and DNS is working.

dnsmasq has been configured to service DHCP requests and to listen on all 
available interfaces.
Even on WAN interface? Hm.

xen-create-image with appropriate parameters created me a DHCP virtual machine 
(also running wheezy and the 3.2.0 kernel) which starts successfully.

brctl show displays eth0 as a bridge connected to peth0 and vif4.0 (the ID of 
the PV VM). But the VM does not seem to have any kind of network access for 
some reason. The dom0 does not seem to be getting the DHCP requests from the 
VM. The VM never successfully obtains a DHCP lease. And even when I set static 
information in the VM, it is not able to ping the dom0. What am I doing wrong? 
I don't even know what information to post with this because I don't know where 
to try to start troubleshooting the problem. The key is, I don't want the VMs 
to have just Internet access (else I would bridge them to eth1). I want them to 
get full network access, including the ability to get DHCP from dom0.
Can you please show the "vif=" line from your DomU config file, the output of "xm list" and "brctl show"?

You also might want to check for netfilter configuration (iptables -L -v) and the "forward delay" parameter of your bridges.

Alexandre Kouznetsov

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