HOW MAC ADDRESS LEARNING HOW TO
HOW MAC ADDRESS LEARNING MAC

HOW MAC ADDRESS LEARNING MAC

Then, since the blue switch does not yet have an entry in tis MAC address table for, the frame is duplicated and flooded out every port. When the frame arrives on the blue switch, the first thing that happens is the blue switch learns the MAC address exists on port 1. They will populate as the switches learn of each device connected to each port by reading the Source MAC address field of each received frame. To begin, the MAC address tables for both switches will be empty. The switches will use the information in the Layer2 header to move the frame between the two hosts. The Layer2 header would include a Source MAC address of and a Destination MAC address of. The Layer3 header would include a Source IP address of 10.0.0.11 (Host A) and a Destination IP address of 10.0.0.22 (Host B). The contents of the frame are irrelevant, it could be an ICMP (ping) packet, it could be an ARP packet, or it could be other data. It starts with Host A having a frame to deliver to Host B.

Continued communication between Host A and Host B.

We will illustrate each step that occurs for each of the following: Port 3 on the blue switch is connected to port 4 on the green switch. Host B and D are connected to ports 5 and 6 of the green switch on the right. Host A and C are connected to ports 1 and 2 of the blue switch on the left. Our topology has two switches, and each has their own, independent MAC address table - the information in the MAC address tables are never shared. We will illustrate how data moves between multiple switches using the following topology: The process does not change, it is simply replicated separately by other switches. With multiple switches, each switch will still independently perform the exact same four functions. In the Packet Traveling series, we discussed the four specific functions of a switch: Learning, Flooding, Forwarding, and Filtering we then illustrated each function in an animation that showed two hosts communicating through a single switch. This article will illustrate the process using two switches. One of the most frequent requests I receive is asking how the process would be different if there were multiple switches.

HOW MAC ADDRESS LEARNING HOW TO

In this tutorial, we learned how to change the MAC address of a network card using two different methods and after changing we also verify that new MAC address.In a previous article we demonstrated how a single switch functions. # sudo systemctl restart networkĪgain, verify the new MAC address. # sudo vim /etc/sysconfig/network-scripts/ifcfg-ens37Īdd/Edit the MACADDR according to your own MAC address.Įxit and save the configuration file and restart the network, using the following command. You can also change the MAC address from the configuration file, for this open up the configuration file of that specific interface. Method 2: using the network configuration file New MAC address has assigned successfully. Now, verify the new MAC address by using the following command.

Advertisement # sudo ip link set dev ens37 up # sudo ip link set dev ens37 address XX:XX:XX:XX:XX:XXįinally, turn on the interface with the following command. Next, assign the MAC address of your own choice using the following command. So adjust the command to match your network card device name.

The word ens37 is the device name of the network card, it might differ on your system. Navigate to the terminal and use the following command. To change the MAC address of a network card, you have to turn off that network card. Use this method with an additional network card. If you do this, it will disconnect your network connection. Please be careful not to change your mac address with the live network card. Sample output is attached below for reference. These commands will display the hardware address of your network interface card. To find out the MAC address or hardware address of a network interface, open the terminal and use anyone of the following command.

In this tutorial, we will learn how to change the MAC address in CentOS8. Changing of MAC address is also known as MAC Spoofing or FAKE address. If you don’t want to expose your device MAC address while connecting to Public WIFI’s or maybe the firewall or router blocked the specific MAC address, changing of MAC address to access internet service without being exposing the original MAC address.

How mac address learning