The simplest method is what is known as a Directly Connected route. We will discuss two of them in this section. There are multiple ways a Router can learn the routes to each network. The Routing Table starts empty, and is populated as the Router learns of new routes to each network. Populating a Routing Tableįrom the perspective of each Router, the Routing Table is the map of all networks in existence. In order to forward packets between networks, a router must perform two functions: populate and maintain a Routing Table, and populate and maintain an ARP Table.
Both of the routers have an interface in the 22.22.22.x network. And we have R2 creating a boundary between the 22.22.22.x and 33.33.33.x networks. Notice in the image above, we have R1 creating a boundary between the 11.11.11.x network and the 22.22.22.x network. As such, every router creates a boundary between two networks, and their main role is to forward packets from one network to the next. Router FunctionsĮarlier we mentioned that a Router’s primary purpose is to facilitate communication between networks. We will focus on R1, and what is required for it to forward packets from Host A, to Host B and Host C.įor simplicity, the MAC addresses of each NIC will be abbreviated to just four hex digits. To discuss our way through these concepts, we will use the following image. We will start by looking at the two major Router Functions, then see them in action as we look at Router Operation. It might be worth reviewing that section before proceeding.
This article will be the practical application of everything that was discussed when we looked at a Router as a key player in Packet Traveling. Now we add another network device as we look at what it takes for traffic to pass from host to host through a Router. And we’ve looked at what it takes for a host to speak to another host through a switch. We’ve looked at what it takes for two hosts directly connected to each other to communicate. Use the navigation boxes to view the rest of the articles. This article is a part of a series on Packet Traveling - everything that happens in order to get a packet from here to there.
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