1.进入到/etc/sysconfig/network-scripts/ 目录
[root@kvm ~]# cd /etc/sysconfig/network-scripts/
[root@kvm network-scripts]# ls
ifcfg-eth0 ifdown-ib ifdown-ppp ifup-aliases ifup-ipv6 ifup-ppp init.ipv6-global
ifcfg-lo ifdown-ippp ifdown-routes ifup-bnep ifup-isdn ifup-routes net.hotplug
ifdown ifdown-ipv6 ifdown-sit ifup-eth ifup-plip ifup-sit network-functions
ifdown-bnep ifdown-isdn ifdown-tunnel ifup-ib ifup-plusb ifup-tunnel network-functions-ipv6
ifdown-eth ifdown-post ifup ifup-ippp ifup-post ifup-wireless
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2.复制当前 eth0 配置文件为 ifcfg-br0
[root@kvm network-scripts]# cp ifcfg-eth0 ifcfg-br0
3.修改 eth0 配置文件，末尾追加 BRIDGE=br0
[root@kvm network-scripts]
DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=10.1.100.131
PREFIX=24
GATEWAY=10.1.100.2
DNS1=223.5.5.5
DOMAIN=223.6.6.6
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
BRIDGE=br0
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4.修改 br0配置文件
DEVICE=br0
TYPE=Bridge
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=dhcp
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5.重启网卡，并观察网卡信息变化
[root@kvm network-scripts]# /etc/init.d/network restart
正在关闭接口 eth0： bridge br0 does not exist!
[确定]
关闭环回接口： [确定]
弹出环回接口： [确定]
弹出界面 eth0： [确定]
弹出界面 br0：
正在决定 br0 的 IP 信息...完成。
[确定]
[root@kvm network-scripts]# ifconfig
br0 Link encap:Ethernet HWaddr 00:0C:29:5F:F4:17
inet addr:10.1.100.131 Bcast:10.1.100.255 Mask:255.255.255.0
inet6 addr: fe80::20c:29ff:fe5f:f417/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:26 errors:0 dropped:0 overruns:0 frame:0
TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:2070 (2.0 KiB) TX bytes:2878 (2.8 KiB)
eth0 Link encap:Ethernet HWaddr 00:0C:29:5F:F4:17
inet6 addr: fe80::20c:29ff:fe5f:f417/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:100644 errors:0 dropped:0 overruns:0 frame:0
TX packets:20490 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:129452127 (123.4 MiB) TX bytes:1840714 (1.7 MiB)
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:504 (504.0 b) TX bytes:504 (504.0 b)
virbr0 Link encap:Ethernet HWaddr 52:54:00:37:8D:EF
inet addr:192.168.122.1 Bcast:192.168.122.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
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查看桥接接口
[root@kvm network-scripts]# brctl show
bridge name bridge id STP enabled interfaces
br0 8000.000c295ff417 no eth0
virbr0 8000.525400378def yes virbr0-nic
[root@kvm network-scripts]# brctl --help
Usage: brctl [commands]
commands:
addbr <bridge> add bridge
delbr <bridge> delete bridge
addif <bridge> <device> add interface to bridge
delif <bridge> <device> delete interface from bridge
setageing <bridge> <time> set ageing time
setbridgeprio <bridge> <prio> set bridge priority
setfd <bridge> <time> set bridge forward delay
sethello <bridge> <time> set hello time
setmaxage <bridge> <time> set max message age
sethashel <bridge> <int> set hash elasticity
sethashmax <bridge> <int> set hash max
setmclmc <bridge> <int> set multicast last member count
setmcrouter <bridge> <int> set multicast router
setmcsnoop <bridge> <int> set multicast snooping
setmcsqc <bridge> <int> set multicast startup query count
setmclmi <bridge> <time> set multicast last member interval
setmcmi <bridge> <time> set multicast membership interval
setmcqpi <bridge> <time> set multicast querier interval
setmcqi <bridge> <time> set multicast query interval
setmcqri <bridge> <time> set multicast query response interval
setmcqri <bridge> <time> set multicast startup query interval
setpathcost <bridge> <port> <cost> set path cost
setportprio <bridge> <port> <prio> set port priority
setportmcrouter <bridge> <port> <int> set port multicast router
show [ <bridge> ] show a list of bridges
showmacs <bridge> show a list of mac addrs
showstp <bridge> show bridge stp info
stp <bridge> {on|off} turn stp on/off
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