IPv4 Routing Process Reference
Because you already saw the basics back in Chapter 3, this section collects the routing process
into steps for reference. The steps use many specific Ethernet LAN terms discussed in Parts II and
III of this book and some IP addressing terms discussed in Part IV. 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:
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