May 2006
Intermediate to advanced
480 pages
12h 20m
English
Content preview from Understanding TCP/IPBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 7. Routing
IP routing and IP forwarding are two processes that are at the very foundation of the Internet. Every system with TCP/IP protocol installed has at least one network interface called loopback. Besides, it can have one or more network interface cards installed. Let us imagine we have received one link frame, carrying an IP datagram, through the first installed network interface card. Its processing, summarized in Figure 7.1, can be described in the following steps:
- The IP datagram is extracted from the link frame. The senders link address can be used to refresh the ARP cache.
- The extracted IP datagram is inserted into an input queue and waits here for its processing.
- Processing of the header options is the first step within the ...
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