Definitive Guide to Linux Network Programming by Nathan Yocom, Visit Amazon's John Turner Page, search

By Nathan Yocom, Visit Amazon's John Turner Page, search results, Learn about Author Central, John Turner, , Visit Amazon's Keir Davis Page, search results, Learn about Author Central, Keir Davis,

* transparent and plentiful examples, utilizing real-world code, written by way of 3 skilled builders who write networking code for a dwelling.

* Describes easy methods to construct consumers and servers, explains how TCP, UDP, and IP paintings, and indicates the right way to debug networking purposes through packet sniffing and deconstruction.

* compatible for home windows developer trying to extend to Linux, or for the trained Linux developer seeking to contain client-server programming into their software.

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This datagram also consists of both a header portion and a data portion. Table 1-4 lists the format of the IP datagram header, along with the size of each field within the header. qxd 7/8/04 9:09 PM Page 18 Chapter 1 Table 1-4. qxd 7/8/04 9:09 PM Page 19 Networks and Protocols Most of these fields look pretty similar to the description of an Ethernet frame. What is the relationship between Ethernet frames, or packets, and IP datagrams? Remember that IP is hardware independent and that Ethernet is hardware.

TCP considers a certain number of packets to be a window and transmits all packets in that window without waiting for confirmation on each one. Once the confirmation is received for the first packet in the window, the window “slides” to contain the next packet to be sent, and it is sent. For example, if the window size was 8, then packets 1 through 8 would be sent. When the confirmation for packet 1 was received, the window would “slide” so that it covered packets 2 through 9, and the ninth packet would be sent.

The reassembly is made possible by the fragment offset field of the datagram header, which tells the receiver where this particular fragment should go. qxd 7/8/04 9:09 PM Page 20 Chapter 1 original datagram header, with some minor changes. The fragment’s header differs because, if there are more fragments, the “more fragments” flag is set, and the fragment offset will change on each fragment to prevent overwriting. Thus, an IP datagram of 4000 octets might get fragmented into three Ethernet frames, two containing the maximum data size and the third containing what’s left.

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