linux双网卡绑定一个IP

Linux双网卡绑定是通过bonding技术实现使用两块网卡成为一块网卡设备，两块网卡共用一个IP，可实现负载均衡，网卡冗余。前提是bonding使用相同型号的网卡芯片

 

通过以下命令查看是否支持bonding，默认redhat5.x已支持
#modinfo bonding
filename:       /lib/modules/2.6.18-164.el5/kernel/drivers/net/bonding/bonding.ko
author:         Thomas Davis, [email protected] and many others
description:    Ethernet Channel Bonding Driver, v3.4.0
version:        3.4.0
#cd /etc/sysconfig/network-scripts/
#cp ifcfg-lo ifcfg-bond0
#vi ifcfg-bond0
DEVICE=bond0
IPADDR=192.168.0.15
NETMASK=255.255.255.0
GATEWAY=192.168.0.1
ONBOOT=yes
USERCTL=no
BOOTPROTO=none

#vi ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:0C:29:23:38:03
ONBOOT=yes
MASTER=bond0
SLAVE=yes

#vi ifcfg-eth1
DEVICE=eth1
BOOTPROTO=none
HWADDR=00:0C:29:23:38:0D
ONBOOT=yes
MASTER=bond0
SLAVE=yes

#vi /etc/modprobe.conf
末行添加
alias bond0 bonding
options bond0 miimon=100 mode=1
BONDING_OPTS选项中的mode=0指的是使用指负载均衡模式,如果这个参数为1，表示冗余功能。miimon=100表示系统每100ms监测一次链路连接状态，如果有一条线路不通就转入另一条线路。

#/etc/init.d/network restart
#ifconfig
bond0     Link encap:Ethernet  HWaddr 00:0C:29:41:E1:48
          inet addr:192.168.0.254  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fe41:e148/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:2913 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2338 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:274948 (268.5 KiB)  TX bytes:357004 (348.6 KiB)

eth0      Link encap:Ethernet  HWaddr 00:0C:29:41:E1:48
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:2289 errors:0 dropped:0 overruns:0 frame:0
          TX packets:2176 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:209531 (204.6 KiB)  TX bytes:326498 (318.8 KiB)
          Interrupt:59 Base address:0x2024

eth1      Link encap:Ethernet  HWaddr 00:0C:29:41:E1:48
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1

#cat /proc/net/bonding/bond0
Ethernet Channel Bonding Driver: v3.4.0 (October 7, 2008)

Bonding Mode: load balancing (round-robin)
MII Status: up
MII Polling Interval (ms): 100
Up Delay (ms): 0
Down Delay (ms): 0

Slave Interface: eth0
MII Status: up
Link Failure Count: 1
Permanent HW addr: 00:0c:29:41:e1:48

Slave Interface: eth1
MII Status: up
Link Failure Count: 1
Permanent HW addr: 00:0c:29:41:e1:52

通过bonding技术实现网卡负载均衡模式就可以了