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In this section, we are going
to start learning about routing.

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In the simple word, routing is communication
between computer in the different block subnet.

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For example, let’s import a router, as
always, I use 2811, let’s also import 2 pc,

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and then connecting this two pc to the router.

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Remember that router is used to connecting
many pc in the different block subnet,

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so this 2 pc must be in
the different block subnet.

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Let’s say here we will configure
192.168.1.0/24 and then here 192.168.2.0/24.

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Let’s change the name of the pc,
this is pc 2, and this is pc 1.

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Let’s configure the ip the ip
address of the pc, start from pc 1,

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desktop, ip configuration, the
ip address is 192.168.1.10,

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Remember that if computer want to communicate with
others computer in the different block subnet,

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so the computer will need a gateway, in this case
the gateway will be the ip address of router,

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let’s say the ip address of
router will be 192.168.1.1,

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and then the ip address that
connected to pc 2 is 192.168.2.1,

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So for pc 1, the gateway will be 192.168.1.1,
and the gateway for pc 2 will be 192.168.2.1

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Here for pc 1, the gateway is
192.168.1.1. Next for pc 2,

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the ip address is 192.168.2.10,
and the gateway is 192.168.2.1.

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Next, let’s configure the
ip address on the router.

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No, enable, configure terminal, interface fa0/0,
no shutdown to enable the interface,

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okay now the light is green, then ip address 192.168.1.1
255.255.255.0, okay we have done for fa0/0.

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Next for fa0/1, int fa0/1, no shutdown, the
ip address is 192.168.2.1 255.255.255.0,

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Okay now we have done configuring
the ip address in the router,

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Now pc 1 and pc 2 should be able to communicate.
Let’s try, ping to pc 2, 192.168.2.10,

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okay here we can see that the result is success.

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So this is routing, which
is communication between pc

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in the different block
subnet or different network.

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How routing work? When pc 1 want to send packet
to pc 2, pc 1 will ask the gateway or the router,

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"hey router, do you know where is 192.168.2.10?"

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When the router recieve a question like
this, the router will check routing table,

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To see the routing table, the
command is do show ip route.

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Here we can see that we have 2 entry in
the routing table, which is 192.168.1.0/24

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in fa0/0, and 192.168.2.0/24 in fa0/1.

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Routing table is used to show which
network are able to reach by the router.

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In this case router are able to reach
192.168.1.0/24 which is connected to fa0/0,

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and also able to reach 192.168.2.0/24
which is connected to fa0/1.

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So when pc 1 ping to pc 2, pc 1 will
ask the router where is 192.168.2.10,

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the router know that 192.168.2.10 is in the
fa0/1, so the packet will forwarded to fa0/1.

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When the packet arrive in pc2,
pc2 will send reply packet,

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now the destination is 192.168.1.10 which is the
ip address of pc 1. So pc 2 will ask the router,

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"hey router, do you know where is 192.168.1.10?"
the router will see the routing table,

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and the router know that 192.168.1.10 is in the
fa0/0, so the packet will be forwarded to fa0/0.

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That is how routing work.

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Okay I think enough for this video, in the
next video, we are going to add 1 more router,

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Thankyou for watching and
see you on the next video.