How to integrate dual NICs with "1" in Linux

Article Title: How to enable dual NICs to be used together in Linux. Linux is a technology channel of the IT lab in China. The network connectivity of some basic classification servers, such as desktop applications, Linux system management, kernel research, embedded systems, and open source, directly affects the availability of servers. the dual-NIC binding technology is used, server Nic failure protection and load balancing can improve network performance and ensure high server availability (see ).


Network topology after dual-Nic binding

Dual Nic binding technology

The dual-Nic binding is to virtualize two physical NICs into one logical Nic so that they have the same IP address and combine them into one logical link for work. This technology already exists in Sun and Cisco devices. it is called Trunking and Etherchannel respectively. in Linux, this technology is called Bonding. Bonding was first applied to the cluster Beowulf to improve data transmission efficiency between cluster nodes.

Bonding runs in Promisc mode and modifies the MAC addresses of the two NICs to the same. In hybrid mode, the NIC no longer only receives data frames whose destination hardware address is its MAC address, but can receive all frames on the network. The prerequisite for configuring dual-Nic binding using Bonding technology is that the two NICs have the same chipset model and have independent BIOS chips.

Configuration method

1. specify the nic ip address

Create and modify the ifcfg-bond0 file, and specify the IP address, subnet mask, Nic ID and other information to the virtual Nic (bond0. Note: do not specify this information for a single NIC.

#cp /etc/sysconfig/network-scripts/ifcfg-eth0 ifcfg-bond0 #vi /etc/sysconfig/network-scripts/ifcfg-bond0

Modify the ifcfg-bond0 file to the following:

DEVICE=bond0BOOTPROTO=staticIPADDR=172.31.0.13NETMASK=255.255.252.0BROADCAST=172.31.3.255ONBOOT=yes TYPE=Ethernet

Enter the IP address and broadcast address as required.

In addition, you also need to set the configuration file ifcfg-eth0 of the two NICs and the "BOOTPROTO" in the ifcfg-eth1 to "dhcp ", delete the settings for "IPADDR", "NETMASK", and "BROADCAST.

2. modify the/etc/modules. conf file.

Edit the/etc/modules. conf file and add the following content so that the system can load the Bonding module at startup.

alias bond0 bonding options bond0 miimon=100 mode=1

"Miimon = 100" indicates that the system monitors the link connection status every MS. If one line is detected to be disconnected, it is transferred to another line.

The value of "mode" indicates the working mode. There are four modes: 0, 1, 2, and 3. commonly used are 0 and 1.

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