Ethernet channel bonding enables combining two or more network interface cards into a single virtual interface to increase bandwidth and provide redundancy. It works by load balancing traffic across the cards while failing over to the other card if one goes down. The document then provides steps to configure bonding of two network cards on a Redhat Linux 6 system, including editing configuration files, setting the bonding mode, restarting services, and testing the bonded interface.

1. Nic Bonding with two Network card
REDHAT TRAINING VERSION 6

2. Ethernet Channel Bonding
Ethernet Channel Bonding enables two or more Network Interfaces Card (NIC) to a
single virtual NIC card which may increase the bandwidth and provides redundancy
of NIC Cards. This is a great way to achieve redundant links, fault tolerance or load
balancing networks in production system. If one physical NIC is down or unplugged, it
will automatically move resources to other NIC card. Channel/NIC bonding will work
with the help of bonding driver in Kernel. We’ll be using two NIC to demonstrate the
same
How to configure bonding/teaming on Redhat Linux 6 ?
Nic Bonding with two Network card

3. Nic Bonding with two Network card
The below diagram will explain how the bonding is happening

4. Nic Bonding with two Network card

5. Nic Bonding with two Network card
[root@server ~]# cd /etc/sysconfig/network-scripts/
[root@server network-scripts]#cp -p ifcfg-eth0 ifcfg-eth1
[root@server1 network-scripts]# vim ifcfg-eth1
DEVICE=eth1
HWADDR=00:0C:29:0D:AC:14
BOOTPROTO=none
ONBOOT=yes
TYPE=Ethernet
MASTER=bond0
SLAVE=yes
:wq!
[root@server1 network-scripts]# vim ifcfg-eth0
DEVICE=eth0
BOOTPROTO=none
TYPE=Ethernet
HWADDR=00:0C:29:0D:AC:0A
ONBOOT=yes
MASTER=bond0
SLAVE=yes
:wq!

6. Nic Bonding with two Network card
[root@server1 network-scripts]# vim ifcfg-bond0
DEVICE=bond0
BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.76.129
NETMASK=255.255.255.0
TYPE=Ethernet
BONDING_OPTS="miimon=100 mode=active-backup primary=eth0 fail_over_mac=1"
:wq!
Configuration for Bond0

7. Nic Bonding with two Network card
mode=active-backup (standby)
miimon=100 how often (ms) link status is checked for failure
primary=eth0 sets default lan to use if healthy

8. Nic Bonding with two Network card
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)
balance-rr or 0 — Sets a round-robin policy for fault tolerance and load
balancing. Transmissions are received and sent out sequentially on each bonded slave
interface beginning with the first one available.
active-backup or 1 — Sets an active-backup policy for fault tolerance.
Transmissions are received and sent out via the first available bonded slave interface.
Another bonded slave interface is only used if the active bonded slave interface fails.
balance-xor or 2 — Sets an XOR (exclusive-or) policy for fault tolerance and
load balancing. Using this method, the interface matches up the incoming request's
MAC address with the MAC address for one of the slave NICs. Once this link is
established, transmissions are sent out sequentially beginning with the first available
interface.

9. Nic Bonding with two Network card
broadcast or 3 — Sets a broadcast policy for fault tolerance. All transmissions
are sent on all slave interfaces.
802.3ad or 4 — Sets an IEEE 802.3ad dynamic link aggregation policy. Creates
aggregation groups that share the same speed and duplex settings. Transmits and
receives on all slaves in the active aggregator. Requires a switch that is 802.3ad
compliant.
balance-tlb or 5 — Sets a Transmit Load Balancing (TLB) policy for fault
tolerance and load balancing. The outgoing traffic is distributed according to the
current load on each slave interface. Incoming traffic is received by the current slave.
If the receiving slave fails, another slave takes over the MAC address of the failed
slave.
balance-alb or 6 — Sets an Active Load Balancing (ALB) policy for fault
tolerance and load balancing. Includes transmit and receive load balancing for IPV4

10. Nic Bonding with two Network card
# cd /etc/modprobe.d/
[root@server1 modprobe.d]# vim bonding.conf
alias bond0 bonding
:wq!
#modprobe bonding
#reboot

11. Nic Bonding with two Network card
#ifconfig -a

12. Nic Bonding with two Network card
#service iptables stop
#chkconfig iptables on
#service ip6tables stop
#chkconfig ip6tables on
#service NetworkManager stop
#chkconfig NetworkManager off

13. Nic Bonding with two Network card
#service network restart

14. Nic Bonding with two Network card
After rebooted server
#ifconfig -a

15. Nic Bonding with two Network card
#cat /proc/net/bonding/bond0

16. Nic Bonding with two Network card
Before down eth0

17. Nic Bonding with two Network card
After down eth0

18. Nic Bonding with two Network card
To check the log file
#tail –f /var/log/message
To Up the eth0
#ifconfig eth0 up

19. Nic Bonding with two Network card
To check the log file
#tail –f /var/log/message
To again down the eth0
#ifconfig eth0 down

20. Nic Bonding with two Network card
#watch -n1 "netstat -in"

21. Nic Bonding with two Network card
To check in windows machine in command prompt
cmd> ping 192.168.6.160 -t

22. Nic Bonding with two Network card
Add a NIC card and configure
#cp -p ifcfg-eth0 ifcfg-eth2
#vim ifcfg-eth2

23. Nic Bonding with two Network card
To add a interface to bonding
#ifenslave –f bond0 eth2

24. Nic Bonding with two Network card
To change the eth2 as the primary interface
#ifenslave –c bond0 eth2

25. Nic Bonding with two Network card
To remove a interface from bonding
#ifenslave –d bond0 eth2

26. Nic Bonding with two Network card
TO REMOVE A BOND0
#ifconfig bond0 down
#echo "-bond0" > /sys/class/net/bonding_master (or) bond0
#lsmod | grep -i bond
#rmmod bonding
#lsmod | grep -i bond
#cd /etc/modprobe.d
#ls –l
#rm -rf bonding.conf
#cd /etc/sysconfig/network-scripts
# rm -rf ifcfg-bond0

27. THANK YOU
Network Bonding works with server successfully