本篇文章为大家展示了Linux系统中如何进行网桥搭建，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
工作在数据链路层（L2）。以太网中，数据链路层地址就是mac地址，网桥与hub的区别在于，网桥会过滤mac，只有目的mac地址匹配的数据才会发送到出口。一个bridge指的是一个输入到一个输出的桥接。
brctl   # 桥接管理命令 brctl show ；brctl addbr br0 添加网桥； show   # 显示 addbr   # 添加网桥 delbr   # 删除网桥 addif   # 添加网络桥接 delif  # 删除网络桥接
文件方式的网络桥接。
可以在其真机中操作，操作前提是要将原本的 ifcfg-enp0s25,ifcfg-br0 转移阿到其他的地方，以备后期恢复
计算
安全
数据库
网络和加速
企业服务
[root@foundation12 ~]# cd /etc/sysconfig/network-scripts/ 在此目录下
[root@foundation12 network-scripts]# ls
ifcfg-br0 ifdown-ovs ifup-eth ifup-sit
ifcfg-enp0s25 ifdown-post ifup-ib ifup-Team
ifcfg-lo ifdown-ppp ifup-ippp ifup-TeamPort
ifcfg-小米手机 ifdown-routes ifup-ipv6 ifup-tunnel
ifdown ifdown-sit ifup-isdn ifup-wireless
ifdown-bnep ifdown-Team ifup-ovs init.ipv6-global
ifdown-eth ifdown-TeamPort ifup-plip keys-小米手机
ifdown-ib ifdown-tunnel ifup-plusb network-functions
ifdown-ippp ifup ifup-post network-functions-ipv6
ifdown-ipv6 ifup-aliases ifup-ppp
ifdown-isdn ifup-bnep ifup-routes
[root@foundation12 network-scripts]# mv ifcfg-br0 ifcfg-enp0s25 /opt 移动到其他地方
1234567891011121314在/etc/sysconfig/networl-scipts 目录下 操作新的网络桥接
[root@foundation12 network-scripts]# vim ifcfg-br0 设置真实主机的网卡
[root@foundation12 network-scripts]# ifconfig 查看真实物理网卡
br0: flags=4163 mtu 1500
inet 172.25.12.250 netmask 255.255.255.0 broadcast 172.25.12.255
inet6 fe80::221:ccff:fe6f:78a8 prefixlen 64 scopeid 0x20 ether 00:21:cc:6f:78:a8 txqueuelen 1000 (Ethernet)
RX packets 106032 bytes 133746644 (127.5 MiB)
RX errors 0 dropped 1 overruns 0 frame 0
TX packets 45193 bytes 3062537 (2.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enp0s25: flags=4163 mtu 1500 物理网卡
ether 00:21:cc:6f:78:a8 txqueuelen 1000 (Ethernet)
RX packets 149532 bytes 138685095 (132.2 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 45246 bytes 3249632 (3.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
device interrupt 20 memory 0xf2600000-f2620000
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 1 (Local Loopback)
RX packets 850589 bytes 296471850 (282.7 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 850589 bytes 296471850 (282.7 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
privbr0: flags=4099 mtu 1500
inet 172.25.250.250 netmask 255.255.255.0 broadcast 172.25.250.255
ether 52:54:00:18:3d:3a txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099 mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 52:54:00:b1:87:41 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr1: flags=4099 mtu 1500
ether 52:54:00:d9:96:d6 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vnet0: flags=4163 mtu 1500
inet6 fe80::fc54:ff:fe00:c0a prefixlen 64 scopeid 0x20 ether fe:54:00:00:0c:0a txqueuelen 1000 (Ethernet)
RX packets 167 bytes 29997 (29.2 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 43833 bytes 3052031 (2.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vnet1: flags=4163 mtu 1500
inet6 fe80::fc54:ff:fe21:641b prefixlen 64 scopeid 0x20 ether fe:54:00:21:64:1b txqueuelen 1000 (Ethernet)
RX packets 31 bytes 4118 (4.0 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 58438 bytes 4125919 (3.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
vnet2: flags=4163 mtu 1500
inet6 fe80::fc54:ff:fe67:d8a7 prefixlen 64 scopeid 0x20 ether fe:54:00:67:d8:a7 txqueuelen 1000 (Ethernet)
RX packets 6 bytes 364 (364.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 43808 bytes 3046200 (2.9 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp3s0: flags=4163 mtu 1500
inet 192.168.43.236 netmask 255.255.255.0 broadcast 192.168.43.255
inet6 fe80::2d9f:805d:d4b5:f0d1 prefixlen 64 scopeid 0x20 ether 08:11:96:9a:1f:a4 txqueuelen 1000 (Ethernet)
RX packets 28627 bytes 26833776 (25.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 23792 bytes 8576662 (8.1 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@foundation12 network-scripts]# vim ifcfg-enp0s25 编写物理网卡。
[root@foundation12 network-scripts]# systemctl restart network 重启网络
[root@foundation12 network-scripts]# brctl show 查看网络信息
bridge name bridge id STP enabled interfaces
br0 8000.0021cc6f78a8 no enp0s25 桥接搭建好
privbr0 8000.525400183d3a yes privbr0-nic
virbr0 8000.525400b18741 yes virbr0-nic
virbr1 8000.525400d996d6 yes virbr1-nic
[root@foundation12 network-scripts]# cat ifcfg-br0
DEVICE=br0
ONBOOT=yes
BOOTPROTO=none
IPADDR=172.25.254.12
PREFIX=24
TYPE=Bridge
[root@foundation12 network-scripts]# cat ifcfg-enp0s25
DEVICE=enp0s25
ONBOOT=yes
BOOTPROTO=none
BRIDGE=br0
[root@foundation12 network-scripts]# rm -rf ifcfg-br0
[root@foundation12 network-scripts]# rm -rf ifcfg-enp0s25 删掉自己做的
[root@foundation12 network-scripts]# mv /opt/ifcfg-br0 .
[root@foundation12 network-scripts]# mv /opt/ifcfg-enp0s25 . 将原本的和重新移动回来
[root@foundation12 network-scripts]# ls
ifcfg-br0 ifdown-ovs ifup-eth ifup-sit
ifcfg-enp0s25 ifdown-post ifup-ib ifup-Team
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112网络接口的临时搭建
[root@localhost ~]# brctl show 查看网桥信息
bridge name bridge id STP enabled interfaces
[root@localhost ~]# brctl addbr br0 添加一块新的虚拟接口
[root@localhost ~]# brctl show 查看网桥信息 已经有了 br0 这个虚拟接口
bridge name bridge id STP enabled interfaces
br0 8000.000000000000 no
[root@localhost ~]# ifconfig br0 172.25.254.112/24 给 br0 虚拟接口 赋予一个IP地址
[root@localhost ~]# ifconfig 查看虚拟接口信息 有了IP地址
br0: flags=4163 mtu 1500
inet 172.25.254.112 netmask 255.255.255.0 broadcast 172.25.254.255
inet6 fe80::90b8:3ff:feae:295a prefixlen 64 scopeid 0x20 ether 92:b8:03:ae:29:5a txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 16 bytes 2835 (2.7 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth0: flags=4163 mtu 1500
ether 52:54:00:00:0c:0a txqueuelen 1000 (Ethernet)
RX packets 23707 bytes 1686713 (1.6 MiB)
RX errors 0 dropped 1228 overruns 0 frame 0
TX packets 128 bytes 18818 (18.3 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth2: flags=4163 mtu 1500
ether 52:54:00:67:d8:a7 txqueuelen 1000 (Ethernet)
RX packets 23718 bytes 1686113 (1.6 MiB)
RX errors 0 dropped 4480 overruns 0 frame 0
TX packets 3 bytes 182 (182.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 0 (Local Loopback)
RX packets 3598 bytes 305844 (298.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3598 bytes 305844 (298.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost ~]# ping 172.25.254.12 ping一下主机 ，发现是ping不同的，因为是没有加载在网卡上的
PING 172.25.254.12 (172.25.254.12) 56(84) bytes of data.
From 172.25.254.112 icmp_seq=1 Destination Host Unreachable
From 172.25.254.112 icmp_seq=2 Destination Host Unreachable
From 172.25.254.112 icmp_seq=3 Destination Host Unreachable
From 172.25.254.112 icmp_seq=4 Destination Host Unreachable
^C
--- 172.25.254.12 ping statistics ---
5 packets transmitted, 0 received, +4 errors, 100% packet loss, time 4001ms
[root@localhost ~]# brctl addif br0 eth0 将这个虚拟接口加载到eth0 这块网卡上
[root@localhost ~]# brctl show 查看网桥信息
bridge name bridge id STP enabled interfaces
br0 8000.525400000c0a no eth0 虚拟接口已经装到eth0网卡上
[root@localhost ~]# ping 172.25.254.12 ping 一下是可以ping 通的，因为已经有了网卡的
PING 172.25.254.12 (172.25.254.12) 56(84) bytes of data.
64 bytes from 172.25.254.12: icmp_seq=1 ttl=64 time=0.292 ms
64 bytes from 172.25.254.12: icmp_seq=2 ttl=64 time=0.143 ms
64 bytes from 172.25.254.12: icmp_seq=3 ttl=64 time=0.214 ms
64 bytes from 172.25.254.12: icmp_seq=4 ttl=64 time=0.220 ms
^C
--- 172.25.254.12 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2999ms
rtt min/avg/max/mdev = 0.143/0.217/0.292/0.053 ms
[root@localhost ~]#
1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 [root@localhost Desktop]# brctl show 查看网桥的信息
bridge name bridge id STP enabled interfaces
br0 8000.525400000c0a no eth0
[root@localhost Desktop]# brctl delif br0 eth0 将br0这个虚拟接口 从eth0这块网卡上删除掉
[root@localhost Desktop]# brctl show 再次查看网桥信息 已经没有了eth0 这块网卡
bridge name bridge id STP enabled interfaces
br0 8000.000000000000 no
[root@localhost Desktop]# ifconfig br0 down 因为正在工作的，所以是要让其down掉，才能删除
[root@localhost Desktop]# brctl delbr br0 删除虚拟接口
[root@localhost Desktop]# brctl show 查看网桥信息 是已经全部没有了
bridge name bridge id STP enabled interfaces
[root@localhost Desktop]# ifconfig 查看网络信息 ，已经没有了br0临时接口
eth0: flags=4163 mtu 1500
ether 52:54:00:00:0c:0a txqueuelen 1000 (Ethernet)
RX packets 44359 bytes 3095658 (2.9 MiB)
RX errors 0 dropped 1228 overruns 0 frame 0
TX packets 166 bytes 29931 (29.2 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
eth2: flags=4163 mtu 1500
ether 52:54:00:67:d8:a7 txqueuelen 1000 (Ethernet)
RX packets 44334 bytes 3089827 (2.9 MiB)
RX errors 0 dropped 4481 overruns 0 frame 0
TX packets 3 bytes 182 (182.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73 mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10 loop txqueuelen 0 (Local Loopback)
RX packets 3859 bytes 328676 (320.9 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 3859 bytes 328676 (320.9 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
[root@localhost Desktop]#上述内容就是Linux系统中如何进行网桥搭建，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注亿速云行业资讯频道。
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