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Hands-On Network Programming with C

You're reading from   Hands-On Network Programming with C Learn socket programming in C and write secure and optimized network code

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Product type Paperback
Published in May 2019
Publisher Packt
ISBN-13 9781789349863
Length 478 pages
Edition 1st Edition
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Author (1):
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Lewis Van Winkle Lewis Van Winkle
Author Profile Icon Lewis Van Winkle
Lewis Van Winkle
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Table of Contents (26) Chapters Close

Title Page
Copyright and Credits
Dedication
About Packt Contributors Preface 1. Introducing Networks and Protocols FREE CHAPTER 2. Getting to Grips with Socket APIs 3. An In-Depth Overview of TCP Connections 4. Establishing UDP Connections 5. Hostname Resolution and DNS 6. Building a Simple Web Client 7. Building a Simple Web Server 8. Making Your Program Send Email 9. Loading Secure Web Pages with HTTPS and OpenSSL 10. Implementing a Secure Web Server 11. Establishing SSH Connections with libssh 12. Network Monitoring and Security 13. Socket Programming Tips and Pitfalls 14. Web Programming for the Internet of Things 1. Answers to Questions 2. Setting Up Your C Compiler on Windows 3. Setting Up Your C Compiler on Linux 4. Setting Up Your C Compiler on macOS 5. Example Programs 6. Other Book You May Enjoy

Testing reachability

Perhaps the most basic network monitoring tool is Ping. Ping uses the Internet Control Message Protocol (ICMP) to check whether a host is reachable. It also commonly reports the total round-trip time (latency). Ping is available as a built-in command or utility for all common operating systems.

The ICMP defines a set of special IP messages that are typically useful for diagnostic and control purposes. Ping works by using two of these messages: echo request and echo reply. The Ping utility sends an echo request ICMP message to a destination host. When that host receives the echo request, it should respond with an echo reply message.

When the echo reply is received, Ping knows that the destination host is reachable. Ping can also report the round-trip time from when the echo request was sent to when the echo reply was received. ICMP echo messages are usually...

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