Description
These instructions will show you how to combine 2 NICs (Network Interface Cards) into 1, commonly referred to as NIC bonding.
Requirements
Explanation of requirements.
- Root access to the system
- 2 physical network cards
Doing the work
Basic description of what will be done and what is expected.
- Create bond0 config file:
- Edit eth0 config file:
- Edit eth1 config file:
- Load the modules on boot:
vi /etc/sysconfig/network-scripts/ifcfg-bond0
Add the following lines:
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DEVICE=bond0 IPADDR=192.168.1.20 NETWORK=192.168.1.0 NETMASK=255.255.255.0 USERCTL=no BOOTPROTO=none ONBOOT=yes (Replace above IP address with your actual IP address. Save file and exit to shell, esc :wq) |
vi /etc/sysconfig/network-scripts/ifcfg-eth0
Add the following lines:
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DEVICE=eth0 USERCTL=no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none |
vi /etc/sysconfig/network-scripts/ifcfg-eth1
Add the following lines:
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DEVICE=eth1 USERCTL=no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none |
vi /etc/modprobe.conf
Add the following lines:
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alias bond0 bonding options bond0 mode=balance-alb miimon=100 |
Troubleshooting
How to test
Explanation troubleshooting basics and expectations.
- Load the modules, restart the network show the satus of the interface:
- list the interfaces seen by the system:
modprobe bonding && service network restart && less /proc/net/bonding/bond0
Output:
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Bonding Mode: load balancing (round-robin) MII Status: up MII Polling Interval (ms): 0 Up Delay (ms): 0 Down Delay (ms): 0 Slave Interface: eth0 MII Status: up Link Failure Count: 0 Permanent HW addr: 00:0c:29:c6:be:59 Slave Interface: eth1 MII Status: up Link Failure Count: 0 Permanent HW addr: 00:0c:29:c6:be:63 |
ifconfig
Output:
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bond0 Link encap:Ethernet HWaddr 00:0C:29:C6:BE:59 inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::200:ff:fe00:0/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:2804 errors:0 dropped:0 overruns:0 frame:0 TX packets:1879 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:250825 (244.9 KiB) TX bytes:244683 (238.9 KiB) eth0 Link encap:Ethernet HWaddr 00:0C:29:C6:BE:59 inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fec6:be59/64 Scope:Link UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:2809 errors:0 dropped:0 overruns:0 frame:0 TX packets:1390 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:251161 (245.2 KiB) TX bytes:180289 (176.0 KiB) Interrupt:11 Base address:0x1400 eth1 Link encap:Ethernet HWaddr 00:0C:29:C6:BE:59 inet addr:192.168.1.20 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fec6:be59/64 Scope:Link UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1 RX packets:4 errors:0 dropped:0 overruns:0 frame:0 TX packets:502 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:258 (258.0 b) TX bytes:66516 (64.9 KiB) Interrupt:10 Base address:0x1480 |
Added Reading
Disclaimer
We test this stuff on our own machines, really we do. But you may run into problems, if you do, come to #centoshelp on irc.freenode.net