Practical combat of multiple network card binding in Linux system

For servers, the stability of network equipment is particularly important, especially network cards. In a production environment, network card reliability becomes even more critical. When multiple network cards are bound to the same IP address, if one network card is physically damaged, the other network card will automatically be enabled and provide normal services to ensure continuous operation. In other words, only one network card is working, and by default, the other network cards act as backup network cards to provide redundant support.

Efficient overlay network transmission rate and load balancing

In file servers, network load balancing is a common application. Especially when faced with the problem of excessive traffic under the IP address and heavy burden on the server network, we can bind multiple network cards into one logical network card. , to improve efficiency and balance load.

For file servers, such as NFS or SAMBA file servers, administrators generally do not use multiple IP addresses to solve network load problems in the internal network. In an intranet environment, in order to facilitate management and application, file servers usually use the same IP address. However, in a 100M LAN, when multiple users access the file server at the same time, the network pressure will be very large, especially for SAMBA and NFS servers. In order to break through the traffic limit of a single IP address and utilize limited resources to achieve network load balancing, many administrators adopt the following methods:

Steps:

1. First set up 2 network cards for the virtual machine:

2. Close NetworkManager in the system:

3. Edit the file /etc/modprobe.d/dist.conf and add alias bond0 bonding:

4. Modify ifcfg-eth0 ifcfg-eth1 in /etc/sysconfig/network-scripts and create bond0:

“

miimon refers to how often to check the network, the unit is ms (milliseconds)
mode=0: Balanced load mode, both network cards are working, load balancing.
mode=1: automatic active and backup mode, one of the network cards is working (if eth0 is disconnected)

”

will automatically switch to another block network card (eth1 as backup) Experimental results:

1. Restart the network. service network restart, or computer.
2. Use another virtual machine to ping the host to which the network card is bound.
3. If you ipdown any network card, network communication will not be affected.

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