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[libvirt-users] Starting libvirtd cuts off host access to external network



I've spent some hours on this without success - any help greatly appreciated.

I've just done a new RHEL6 setup, with a KVM guest (first time). The basic installation works fine until I start libvirtd; at this point, the host machine loses access to the external network:

step 1: ping from host to network works; external machine on network can ping both eth0 and br1 on the host

step 2: /sbin/service libvirtd start

step 3: ping from host to network fails; external machine on the network can't ping either eth0 or br1 on the host

Stopping libvirtd (/sbin/service libvirtd stop) makes no difference - the network remains unreachable.

Any idea why this would happen? I have installed a kvm guest, using the default network script at /etc/libvirtd/qemu/networks/default.xml (although I've changed the IP addresses to be on my subnet, and the DHCP server returns only one address).

I have also configured a bridge; I've attached ifcfg-eth0, ifcfg-eth1, and ifcfg-br1 below. I haven't changed any iptables configuration. If I run the guest (also RHEL6) the guest can talk to the host, but it can't see the outside world.

Thanks -

Paul

================================================

ifcfg-eth0:
-----------

NM_CONTROLLED="no"
DEVICE="eth0"
HWADDR=00:16:E6:8A:C7:20
ONBOOT=yes
TYPE=Ethernet
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
NETMASK=255.255.255.0
BOOTPROTO=dhcp

ifcfg-eth1:
-----------

NM_CONTROLLED="no"
DEVICE="eth1"
HWADDR=00:16:E6:8A:C7:21
ONBOOT=yes
TYPE=Ethernet
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth1"
BRIDGE=br1
NETMASK=255.255.255.0

ifcfg-br1:
----------

NM_CONTROLLED="no"
DEVICE=br1
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Bridge
DELAY=0


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