How to quickly create a virtual network card in Linux

Linux network device configuration files are stored in/etc/sysconfig/network-scripts, For the first network device Ethernet, the configuration file name is generally ifcfg-eth0. To bind one more IP address to the first network device, create a file named ifcfg-eth0: 0 in the/etc/sysconfig/network-scripts directory, as shown in the following example:

Device = "eth0: 0"

Ipaddr = "211.100.10.119"

Netmask = "255.255.255.0"

Onboot = "yes"

Device is the name of the device, ipaddr is the IP address of the device, and netmask is the subnet mask onboot, which indicates automatic start at system startup. If you need to bind another IP address, you only need to add the file name to the eth0: X of the device in the file. Linux supports up to 255 IP aliases

 

Bind one IP address to multiple NICs

You can use multiple NICs to create a network card with the same IP address. This technology actually exists in Sun and Cisco, respectively known as trunking and etherchannel technology. In Linux, this technology is called bonding. Because bonding is included in kernel 2.4.x, you only need to select bonding driver support in network device options during compilation. Then, recompile the core, restart the computer, and execute the following command:

Ismod Bonding

Ifconfig eth0 down

Ifconfig eth1 down

Ifconfig bond0 IPaddress

Ifenslave bond0 eth0

Ifenslave bond0 eth1

Now the two NICs work like one, which can improve data transmission between cluster nodes. You 'd better write these statements as a script, which is then called by/etc/rc. d/rc. Local to take effect on the server. Bonding is a good choice for Servers. When there is no Gigabit Nic, using two or three 100 m NICs as bonding can greatly increase the bandwidth between servers and switches. However, you need to set the two ports mapped to the same Virtual Interface on the vswitch to connect to the bonding Nic.