Network Bonding or Nic Teaming or Link Aggregation in Linux


Link aggregation or trunking or link bundling or Ethernet/network/NIC bonding or NIC teaming are computer networking terms to describe various methods of combining (aggregating) multiple network connections in parallel to increase throughput beyond what a single connection could sustain, and to provide redundancy in case one of the links fails.

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The Linux bonding driver provides a method for aggregating multiple network interfaces into a single logical bonded interface. The behavior of the bonded interfaces depends upon the mode; generally speaking, modes provide either hot standby or load balancing services. Additionally, link integrity monitoring may be performed.

Steps for performing NIC Teaming

Go-to your network-scripts directory and modify your eth0 and eth1 file.

[root@server199 ~]# cd /etc/sysconfig/network-scripts

[root@server199 network-scripts]# vim ifcfg-eth0
#Bonding eth0 to bond0
DEVICE=eth0
USERCTL=yes
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
TYPE=Ethernet
HWADDR=00:1c:c0:f8:3e:a9
[root@server199 network-scripts]# vim ifcfg-eth1
# Bonding eth1 to bond0
DEVICE=eth1
USERCTL=no
ONBOOT=yes
MASTER=bond0
SLAVE=yes
BOOTPROTO=none
TYPE=Ethernet
PEERDNS=yes
IPV6INIT=no
HWADDR=00:06:29:af:c2:6c
[root@server199 network-scripts]# 
Create a new file called ifcfg-bond0 and below line to it.
[root@server199 network-scripts]# vim ifcfg-bond0
DEVICE=bond0
IPADDR=192.168.2.199
NETMASK=255.255.255.0
TYPE=BOND
GATEWAY=192.168.2.1
USERCTL=no
BOOTPROTO=none
ONBOOT=yes

Now edit /etc/modprobe.conf file by adding following two lines.

alias bond0 bonding
options bond0 mode=balance-alb miimon=100

Next Restart network service

 [root@server199 network-scripts]# service network reload
Shutting down interface bond0:                            [  OK  ]
Shutting down loopback interface:                        [  OK  ]
Disabling IPv4 packet forwarding:  net.ipv4.ip_forward = 0
                                                                             [  OK  ]
Bringing up loopback interface:                            [  OK  ]
Bringing up interface bond0:                               [  OK  ]
 
[root@server199 network-scripts]# ifconfig
bond0     Link encap:Ethernet  HWaddr 00:1C:C0:F8:3E:A9 
          inet addr:192.168.2.199  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::21c:c0ff:fef8:3ea9/64 Scope:Link
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:19257 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21223 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:11049157 (10.5 MiB)  TX bytes:2416427 (2.3 MiB)
 
eth0      Link encap:Ethernet  HWaddr 00:1C:C0:F8:3E:A9 
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:14580 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10688 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:9979659 (9.5 MiB)  TX bytes:1232395 (1.1 MiB)
          Memory:d0a00000-d0a20000
 
eth1      Link encap:Ethernet  HWaddr 00:06:29:AF:C2:6C 
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:4677 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10535 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1069498 (1.0 MiB)  TX bytes:1184032 (1.1 MiB)
 
lo        Link encap:Local Loopback 
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:19508 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19508 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6175688 (5.8 MiB)  TX bytes:6175688 (5.8 MiB)

About Alex Hunt

Hi All I am Manish Kumar Jha aka Alex Hunt. I am currently working in VMware Software India Pvt Ltd as Operations System Engineer (vCloud Air Operations). I have around 5 Years of IT experience and have exposure on VMware vSphere, vCloud Director, RHEL and modern data center technologies like Cisco UCS and Cisco Nexus 1000v and NSX. If you find any post informational to you please press like and share it across social media and leave your comments if you want to discuss further on any post. Disclaimer: All the information on this website is published in good faith and for general information purpose only. I don’t make any warranties about the completeness, reliability and accuracy of this information. Any action you take upon the information you find on this blog is strictly at your own risk. The Views and opinions published on this blog are my own and not the opinions of my employer or any of the vendors of the product discussed.
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