Routing

How a Host Routes

For example, if PC1 wanted to send a packet to 192.168.10.20, it would:

1. Consult the IPv4 Route Table.

2. Match the destination IP address with the 192.168.10.0 Network Destination entry to reveal that the host is on the same network (On-link).

3. PC1 would then send the packet toward the final destination using its local interface (192.168.10.10).

Figure 1 highlights the matched route.

If PC1 wanted to send a packet to a remote host located at 10.10.10.10, it would:

1. Consult the IPv4 Route Table.

2. Find that there is no exact match for the destination IP address.

3. Choose the local default route (0.0.0.0) to reveal that it should forward the packet to the 192.168.10.1 gateway address.

4. PC1 then forwards the packet to the gateway for using its local interface (192.168.10.10). The gateway device then determines the next path for the packet to reach the final destination address of 10.10.10.10.

Figure 2 highlights the matched route.