Stuff

Host OS: CentOS
Host has two ethernet devices, eth0, eth1
Bridge configured as:

bridge name     bridge id               STP enabled     interfaces
br0             8000.00304873076a       no              vbox0
                                                        eth1

br0       Link encap:Ethernet  HWaddr 00:30:48:73:07:6A  
          inet addr:66.36.244.236  Bcast:66.36.243.255  Mask:255.255.254.0
          inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:811 errors:0 dropped:0 overruns:0 frame:0
          TX packets:549 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:104561 (102.1 KiB)  TX bytes:57682 (56.3 KiB)

Guest OS: Fedora
Guest has single ethernet device, eth0

eth0 configured (/etc/sysconfig/network-scripts/ifcfg-eth0):

DEVICE=eth0
BOOTPROTO=none
IPADDR=66.36.244.235
NETMASK=255.255.254.0
NETWORK=66.36.244.0
ONBOOT=yes