Als je een active/backup configuratie wil maken op een CentOS machine met 2 of meer NICS.
Ook kan je een LAG maken voor extra bandbreedte. 


Bond Interface aanmaken

Open /etc/modprobe.conf 

nano /etc/modprobe.conf

en voeg de volgende regels toe.

alias bond0 bonding 
options bond0 miimon=80 mode=5

Bonding modes

mode=0 (Balance Round Robin)
mode=1 (Active backup)
mode=2 (Balance XOR)
mode=3 (Broadcast)
mode=4 (802.3ad)
mode=5 (Balance TLB)
mode=6 (Balance ALB)

Zie ook voor meer uitleg verderop

Aanmaken configuratie bond interface

maak het bestand /etc/sysconfig/network-scripts/ifcfg-bond0 

nano /etc/sysconfig/network-scripts/ifcfg-bond0

aan met de volgende inhoud:


Controleer de bestaande ethernet interfaces

nano /etc/sysconfig/network-scripts/ifcfg-eth0

Hierin moet minimaal het volgende staan. DHCP moet uit staan in iedergeval.


Herhaal dit voor alle interfaces die moeten deelnemen in de bond.

Status controleren

cat /proc/net/bonding/bond0

 Uitgebreide uitleg modes

mode=1 (active-backup)

Active-backup policy: Only one slave in the bond is active. A different slave becomes active if, and only if, the active slave fails. The bond's MAC address is externally visible on only one port (network adapter) to avoid confusing the switch. This mode provides fault tolerance. The primary option affects the behavior of this mode.

mode=2 (balance-xor)

XOR policy: Transmit based on [(source MAC address XOR'd with destination MAC address) modulo slave count]. This selects the same slave for each destination MAC address. This mode provides load balancing and fault tolerance.

mode=3 (broadcast)

Broadcast policy: transmits everything on all slave interfaces. This mode provides fault tolerance.

mode=4 (802.3ad)

IEEE 802.3ad Dynamic link aggregation. Creates aggregation groups that share the same speed and duplex settings. Utilizes all slaves in the active aggregator according to the 802.3ad specification.

  • Pre-requisites:
    • Ethtool support in the base drivers for retrieving the speed and duplex of each slave.
    • A switch that supports IEEE 802.3ad Dynamic link aggregation. Most switches will require some type of configuration to enable 802.3ad mode.

mode=5 (balance-tlb)

Adaptive transmit load balancing: channel bonding that does not require any special switch support. The outgoing traffic is distributed according to the current load (computed relative to the speed) on each slave. Incoming traffic is received by the current slave. If the receiving slave fails, another slave takes over the MAC address of the failed receiving slave.

  • Prerequisite: Ethtool support in the base drivers for retrieving the speed of each slave.

mode=6 (balance-alb)

Adaptive load balancing: includes balance-tlb plus receive load balancing (rlb) for IPV4 traffic, and does not require any special switch support. The receive load balancing is achieved by ARP negotiation. The bonding driver intercepts the ARP Replies sent by the local system on their way out and overwrites the source hardware address with the unique hardware address of one of the slaves in the bond such that different peers use different hardware addresses for the server.