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。
网桥也叫桥接器，是连接两个局域网的一种存储/转发设备，简单的网桥有两个端口，复杂些的网桥可以有更多的端口。
网桥简介：
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。
Linux系统搭建网桥具体步骤：
网络桥接的管理命令
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
[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删除临时的网络接口
[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，欢迎关注编程网行业资讯频道。
