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* transparent and plentiful examples, utilizing real-world code, written by means of 3 skilled builders who write networking code for a dwelling.
* Describes tips on how to construct consumers and servers, explains how TCP, UDP, and IP paintings, and exhibits how one can debug networking functions through packet sniffing and deconstruction.
* well matched for home windows developer trying to extend to Linux, or for the expert Linux developer seeking to contain client-server programming into their software.
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Additional resources for Definitive Guide to Linux Network Programming
Com, the browser makes a connection to port 80 at that IP address and requests the web page. The domain name system is transparent and public. You can make DNS queries in a number of different ways, from using the host and whois commands on your Linux system to using any of the web-based query sites. com that we just described, using the command line. COM Registrar: NETWORK SOLUTIONS, INC. com 2560 Ninth Street Suite 219 Berkeley, CA 94710 US 510-549-5930 fax: 123 123 1234 Record expires on 22-Feb-2007.
On your Linux system, use the man command to get more information on host and whois. Older systems use a utility called nslookup, which performs essentially the same functions as host. It’s also possible to have private DNS information, since any Linux system is capable of acting as a name server. Many companies and organizations use both private, or internal, DNS and public, or external, DNS. Internal DNS is used for those machines that aren’t available to the public. Summary In this chapter, we discussed the basic ingredients for today’s popular networking technologies.
Since modern operating systems allow multiple applications to run simultaneously, you must be able to address multiple applications on the receiving node simultaneously, instead of just one. If you consider that each networked application can “listen” on one or more ports, you can see that by using an IP address and a port, you can communicate with multiple applications simultaneously, up to any limits imposed by the operating system and protocol stack. In the TCP/IP protocol stack, there are two protocols that provide a mechanism that allows applications to communicate with other applications using ports.