What Is A Gateway Of Last Resort?

What Is A Gateway Of Last Resort?

Today let us learn about the Gateway of last resort in detail. Let us understand this concept by using some examples.

Let say some of the routers that are connected to the systems. Each router may have known the thousands of IP addresses and routes. Now, this router will use the default gateway in the network.

If one of the routers doesn’t know where to send the data then it directly moves to the next so that it is connected.

Let’s say we have a network and a packet tracer and the switches routers and two systems are connected as the bus.

Here we are placing PC 1 on the left side and PC 2 on the rightmost side. And in the middle, we have connected all the switches and routers. Here, the Subnet Mask of PC 1 is 255.255.255.0 which belongs to class A. The first network is 5.0.0.0

In the same way, the second network is 10.0.1 0.0 and the third network is 15.0.0.0

Here all the packets will send to the default gateway.

Now let us know what is the Gateway of last resort will be set in each one of the routers that are present in the network.

If the router doesn’t have any route to send the packet, then the address to which it sends the packet is called the gateway of last resort.

Here, if we want to send the packets from router a to router b then there must be a route that must be established between router a and router b.

The main aim of using the Gateway Of Last Resort is to establish your path when no other route is established between the two systems if you want to send the packets between the two routers and if there is no route that is established between them then we will use the Gateway of last resort.

We all know that the known routes are present in the routing table. Hence all the unknown routes which are not present on the routing table will be sent to the default route.

If the route of the packet is not established on the routing table then the default route will come to light. This default takes the packet and sends it to the desired destination.

Here there are some of the IP comments that are introduced in order to configure the gateway of last resort.

We can use the IP default gateway, IP default network and IP route called 0.0.0.0.0.0.0.0

Now let us know each of these IP commands in detail. The first one is the default gateway, the name itself indicates that it should only be used when there is no routing present on the router. That means if no IP routing is present on the Cisco router then we will use this default IP gateway.

The other one is the IP default network.

The IP default network can be used even if the Cisco router is enabled. Hare the router will consider all the routes to the network in order to install the Gateway of last resort.