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
