How to configure two network cards to bridge under CentOS
This article mainly introduces how to configure two network cards bridging under CentOS, which is very detailed and has certain reference value. Friends who are interested must read it!
What is a bridge?
The bridge is at the data link layer, which connects two LAN and forwards frames according to the MAC address, which can be regarded as a low-level router.
Classification of bridges
1. The hardware bridge is a physical ymgl, so you can purchase equipment from cisco or Huawei.
2. The software bridge is controlled by the operating system, and the main control is completed by the operating system. At present, the two major operating systems, linux unix, can complete the bridge function perfectly.
1. Check whether the bridge configuration tool is installed in the system
[root@example ~] # rpm-qa | grep bridge
Bridge-utils-1.2-10.el6.x86_64
2. Create a logical interface for the bridge
[root@example ~] # brctl addbr macbr0
3. Add ethX devices to the bridge
[root@example ~] # brctl addif macbr0 eth2
[root@example ~] # brctl addif macbr0 eth3
4. Put the ethX device in hybrid mode
[root@example ~] # ifconfig eth2 0.0.0.0
[root@example ~] # ifconfig eth3 0.0.0.0
[root@example ~] # ifconfig macbr0
Macbr0 Link encap:Ethernet HWaddr 00:0C:29:EB:59:A4
BROADCAST 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 (0.0b) TX bytes:0 (0.0b)
5. Set the IP of the bridge macbr0
[root@example ~] # ifconfig macbr0 172.16.1.1 Compact 24
Create a permanent bridge configuration
1. Establish a bridge configuration file
[root@example ~] # vi / etc/sysconfig/network-scripts/ifcfg-macbr0
DEVICE=macbr0
TYPE=Bridge
BOOTPROTO=static
IPADDR=172.16.100.1
NETMASK=255.255.255.0
ONBOOT=yes
2. Add the network card to the bridge
[root@example ~] # vi / etc/sysconfig/network-scripts/ifcfg-eth2
DEVICE=eth2
TYPE=Ethernet
ONBOOT=yes
BOOTPROTO=static
IPADDR=0.0.0.0
BRIDGE=macbr0
[root@example ~] # vi / etc/sysconfig/network-scripts/ifcfg-eth3
DEVICE=eth3
TYPE=Ethernet
ONBOOT=yes
BOOTPROTO=static
IPADDR=0.0.0.0
BRIDGE=macbr0
The above is all the contents of the article "how to configure two network cards to bridge under CentOS". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!
