Bridged Networking on a KVM Hypervisor
We will be adding a bridge vnet0 to interface eth0
[root@otoscope ~]# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 yes
Now add this to /etc/sysconfig/network-scripts/ifcfg-vnet0
DEVICE=vnet0
TYPE=Bridge
BOOTPROTO=dhcp
ONBOOT=yes
Add BRIDGE=vnet0 to /etc/sysconfig/network-scripts/ifcfg-eth0:
# Intel Corporation 82579LM Gigabit Network Connection
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:25:90:53:A0:43
ONBOOT=yes
BRIDGE=vnet0
Restart the network service and add the bridge:
service network restart
brctl addif vnet0 eth0
Check:
[root@otoscope ~]# brctl show
bridge name bridge id STP enabled interfaces
virbr0 8000.000000000000 yes
vnet0 8000.00259053a043 no eth0
Now add STP with:
brctl stp vnet0 on
Firewall Rules
Make sure that you’ve set up the proper forwarding rules with IPTables.
Don’t use a general free-for-all like this, though:
iptables -A FORWARD -m state --state NEW -j ACCEPT