Linux dual NIC Bindings

Purpose: Two network card traffic load balanced, redundant

DELL R720:4 block NIC (requires switch support), divided into management network and business Network

System: CentOS6.5

1. Bind the Nic em1 and em2 , the virtual NIC name is BOND1(Management Network)

# CAT/ETC/SYSCONFIG/NETWORK-SCRIPTS/IFCFG-EM1DEVICE=EM1//NIC device name hwaddr=c8:1f:66:e5:33:67//network card MAC address Onboot=yes// With the network boot Bootproto=none//Get IP master=bond1//Bind the virtual NIC name Slave=yes//role is from

# cat/etc/sysconfig/network-scripts/ifcfg-em2device=em2hwaddr=c8:1f:66:e5:33:68onboot=yesbootproto=nonemaster= Bond1slave=yes

# cat IFCFG-BOND1DEVICE=BOND1//virtual network card name Onboot=yes//How to start with network Bootproto=none//Get IP ipaddr=192.168.1.224//IP address net mask=255.255.255.0//Subnet mask gateway=192.168.1.1//Gateway

# grep bond/etc/modprobe.d/dist.conf//Configure binding model, this two lines add to config file last alias bond1 bonding options Bond1 miimon=100 mode=0/System every 100MS Check mode specify load pattern

# grep Bond/etc/rc.localifenslave bond1 em1 em2//Bind the virtual NIC and two physical network cards when the system starts

Restart the machine (you can try another way, load the module or restart the service)

# CAT/PROC/NET/BONDING/BOND1//Detection status Ethernetchannel bonding driver:v3.6.0 (September) Bondingmode:load Balanc  ING (round-robin) miistatus:upmiipolling Interval (ms): 100Up Delay (ms): 0DownDelay (ms): 0 Slaveinterface:em1miistatus: upspeed:1000 mbpsduplex:fulllinkfailure count:0permanenthw addr:c8:1f:66:e5:33:67slavequeue id:0 Slave interface:em2                   MII Status:downSpeed:UnknownDuplex:UnknownLink Failure count:0permanent HW addr:c8:1f:66:e5:33:68slave queue id:0 The physical NIC is disconnected because no cable is plugged in

2. Similarly, the NIC em3 and em4 are bound, the virtual network card name is bond2(Business Network)

# Cat Ifcfg-em3device=em3hwaddr=c8:1f:66:e5:33:69onboot=yesbootproto=nonemaster=bond2slave=yes

# Cat Ifcfg-em4device=em4hwaddr=c8:1f:66:e5:33:6aonboot=yesbootproto=nonemaster=bond2slave=yes

# Cat Ifcfg-bond2device=bond2onboot=yesbootproto=noneipaddr=10.88.253.224netmask=255.255.255.128gateway= 10.88.253.129

# grep Bond/etc/modprobe.d/dist.confalias bond2 bonding options Bond2 miimon=100 mode=0

# grep bond/etc/rc.localifenslave bond1 em3 em4

# Cat/proc/net/bonding/bond2ethernetchannel Bonding driver:v3.6.0 (September) bondingmode:load balancing (Roun D-robin) miistatus:upmiipolling Interval (ms): 100Up Delay (ms): 0DownDelay (ms): 0 SlaveInterface:em3MIIStatus:upSpeed: Mbpsduplex:fulllinkfailure count:0permanenthw addr:c8:1f:66:e5:33:69slavequeue id:0 Slave interface:em4mii Statu s:upspeed:1000 mbpsduplex:fulllink Failure count:0permanent HW addr:c8:1f:66:e5:33:6aslave queue id:0

This article is from the "Esoul" blog, make sure to keep this source http://esoul.blog.51cto.com/7825461/1748627

Linux dual NIC Bindings