OpenStack网卡桥接问题
今天发现创建实例无法访问外部网络，我使用的桥接模式，openstack在eth0创建br0网卡，通过eth0与外部通信。检查发现br0 MAC与eth0 MAC不一致，理论上说br0的MAC是学习eth0的，并且与eth0 MAC保持一致。
# ifconfig br0 | grep HWaddr
br0 Link encap:EthernetHWaddr FE:16:3E:50:37:BD
# ifconfig eth0 | grep HWaddr
eth0 Link encap:EthernetHWaddr 9C:B6:54:95:4D:48
解决办法如下：
# brctl addif br0 eth0
# service network restart
Shutting down interface br1:
Shutting down interface eth0:
Shutting down interface eth1:
Shutting down loopback interface:
Bringing up loopback interface:
Bringing up interface eth0:
Bringing up interface eth1:
Bringing up interface br1:
# ifconfig br0 | grep HWaddr
br0 Link encap:EthernetHWaddr 9C:B6:54:95:4D:48
# ifconfig eth0 | grep HWaddr
eth0 Link encap:EthernetHWaddr 9C:B6:54:95:4D:48
#
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