David Cao

David Cao

David is a Cloud & DevOps Enthusiast. He has years of experience as a Linux engineer. He had working experience in AMD, EMC. He likes Linux, Python, bash, and more. He is a technical blogger and a Software Engineer. He enjoys sharing his learning and contributing to open-source.

What is ICMP type?

ICMP type is the first 8 bits in the ICMP message header. It provides a brief explanation of what the message is for so the receiving network device knows why it is getting the message and how to treat it.…

Understanding ICMP Packets with Examples

Internet Control Message Protocol (ICMP), described in RFC 792 and part of the TCP/IP protocol stack, is an error reporting and control-based protocol used between network devices. ICMP messages are encapsulated into IP datagrams, which are then encapsulated into an…

6 Useful Makefile Examples

A makefile is a special file used to execute a set of actions. The most important purpose is the compilation of programs. Make is a dedicated tool to parse makefiles. Most open-source projects use make to compile a final executable…

Exploring ICMP Protocol with Examples

Internet Control Message Protocol (ICMP) is a network layer protocol that serves the purpose of error reporting and network path diagnostic functions. ICMP messages are sent using a basic IP header. The protocol field in IP header will be set…

Exploring ICMP with Examples

Internet Control Message Protocol (ICMP) is a network layer protocol that serves the purpose of error reporting and network path diagnostic functions. The Ping and Traceroute utility tools leverage ICMP messages for fault detection and isolation. ICMP messages are sent…

2 Ways to Check DNS TTL

DNS TTL, or time to live, is the element of a DNS record that tells the requester how long the record is valid. If the TTL for our DNS record is set to 24 hours, a browser has will continue…

Quick Guide to Check DNS Cache

The primary purpose of DNS cache is to store the location of web servers that we have recently accessed. The next time when we type in that website address, the browser will look for its DNS information in the local…