IPv4 Routing Process Reference
Because you have already seen the basics back in Chapter 4, this section collects the routing process into steps for reference. The steps use many specific terms discussed in Parts II and III of this book. The upcoming descriptions and example then discuss these summaries of routing logic to make sure that each step is clear.
The routing process starts with the host that creates the IP packet. First, the host asks the question: Is the destination IP address of this new packet in my local subnet? The host uses its own IP address/mask to determine the range of addresses in the local subnet. Based on its own opinion of the range of addresses in the local subnet, a LAN-based host acts as follows:
Step 1. If the destination ...
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