Redhat(CentOS、Fedora)下的桥接步骤
1,安装桥接软件包yum install bridge-utils 2，修改文件/etc/sysconfig/network-scropts/ifcfg-eth0；
BRIDGE=br0
删除下面
ONBOOT=yes
IPADDR=10.0.0.23
NETMASK=255.255.255.0
GATEWAY=10.0.0.1
DNS1=61.134.1.4 3，建立文件/etc/sysconfig/network-scripts/ifcfg-br0；
BEVICE=br0
BOOTPROTO=none
TYPE=Bridge
ONBOOT=yes
DELAY=0
IPADDR=10.0.0.23
NETMASK=255.255.255.0
GATEWAY=10.0.0.1
DNS1=61.134.1.4
(注意DNS只有一个也要写DNS1，不能直接写DNS) 4，重启；
5，确认网桥是否存在；
/usr/sbin/brct1 show
若成功则显示
# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.000c297c68aa no eth0
# ifconfig br0
br0 Link encap:EthernetHWaddr 00:0C:29:7C:68:AA
inet addr:10.0.0.22Bcast:10.0.0.255Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe7c:68aa/64 Scope:Link
UP BROADCAST RUNNING MULTICASTMTU:1500Metric:1
RX packets:2268 errors:0 dropped:0 overruns:0 frame:0
TX packets:558 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:134076 (130.9 KiB)TX bytes:76172 (74.3 KiB) w查看当前用户
ip addr show eth0
ip -s link show eth0
ip route/traceroute/dig
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