MULTIPLE PASSTHROUGH MAC ADDRESS MAC

MULTIPLE PASSTHROUGH MAC ADDRESS MAC

The MAC addresses, however, are being changed for each new local network that the packet traverses as it is being sent between each pair of routers on its way to the final destination. So Source and Destination IP addresses don’t change as the packet is transmitted and routed over the Internet. Then it can strip off the old destination MAC address (which was the router’s own MAC address) and replace it with a new destination MAC address that points to the next hop router. Based on that destination IP address the router will know which way to forward the packet and which the next hop router will be. When the router receives the packet it will look at the destination IP address of the packet. This is how the computer makes sure that the packet will end up at its default gateway. But the computer must also make sure to add a destination MAC address to the traffic which points to the next hop router. When a computer has a packet to send it knows the destination IP address where it wants to send the traffic. Instead, the switches look at the destination MAC address to see where it should send the packet next. The switches do not deliver packets based on the destination IP address. These switches can be located in a local LAN, or sit between routers on the Internet. The mailman is replaced by Switches in the network environment. In computer networks, it is the role of the MAC address to act as the next hop address on the local LAN.

This can be repeated multiple times, with the letter passing by several such temporary next hop addresses before it is finally delivered. So even though the letter has a final destination address, the mailman will take it to another more temporary stop along the way where the letter can be sorted for further delivery toward the destination. Instead, the mailman will fetch the letter to a mail sorting office. The mailman who fetches the letter from the mailbox is not going to deliver the letter straight to the recipient. The delivery address stays the same until the letter has been delivered no matter where along the delivery path that the letter is currently at.īut even with regular letters, the postal delivery service must use temporary destinations or next-hop addresses where the letter is going to be delivered next. The destination IP address on the IP packet must always stay the same throughout the whole journey, in the same way that the delivery address of a letter that is being sent cannot be changed along the way. Each router forwards the packet to the next router on the path until the packet has reached its final destination. The difference can be compared to a journey to a final destination (IP address) where you can have multiple legs of the journey, each time stopping temporarily at interim stops (routers with local MAC addresses) before moving on.Īn IP packet travelling over the Internet has many such temporary stops along the way in different routers that the packet must pass through. In contrast, MAC addresses are used on a more local scale, and hold information about the next hop destination in the local LAN network.

They hold the final destination of the packet and can tell us which address the packet is originally coming from. IP addresses are relevant on a global scale.

Each time a computer sends out network traffic the traffic has both a source and destination IP address, but it also has a source and destination MAC address. MAC addresses and IP addresses are two completely different types of addresses, but both are used by computers that communicate with each other. Starting from zero and going up to nine, and then continuing further using letters A through F: In the hexadecimal system, each digit can have 16 different values. In our decimal system that we use in everyday life each digit can have 10 values, ranging from zero to nine: It is an address which is written into the network interface of the device during manufacturing.Ī MAC address consists of 12 hexadecimal characters and could look like this: All equipment that can be connected to computer networks (computers, routers, servers, printers, smartphones and so on) have a MAC address.

Multiple passthrough mac address