During program execution, we know that variables are stored in the physical memory (RAM) in the process’ address space. One variable can be stored in multiple bytes. The address of the first byte is called the pointer of the variable. This pointer can be assigned to another (pointer type) variable. The original variable can be … Continue reading “Why Function Pointers are Used in C”
What is ARP and How does it work?
ARP stands for Address Resolution Protocol. It is used by the Internet Protocol (IP) to map IP network addresses (32 bit Logical Address) to the hardware addresses (48 bit Mac Address) used by a data link protocol. The protocol works below the network layer as a part of the interface between the OSI network and OSI link … Continue reading “What is ARP and How does it work?”
How to Download Album from Facebook
You can download all pictures from a Facebook album in a single go. You need to have the viewing permission of that album. This can be done using chrome browser at this moment. Follow these steps. 1. Download and install the PhotoLive chrome extension. Download PhotoLive Chrome extension . 2. Navigate to a Facebook album you … Continue reading “How to Download Album from Facebook”
How to install Ping or Ping6 using YUM
yum install iputils Ping is a network administration utility tool to check reachability of network node (computer or router) from a computer where the command runs. It also gives the round trip time required for a network packet to travel from the source to destination and back. Network administrators use this utility almost every day. … Continue reading “How to install Ping or Ping6 using YUM”
Installing a high availability web server cluster on Ubuntu 12.10 using HAProxy, HeartBeat and Lampp
What is the main objective of this entire topology? Redundancy and Load Sharing! Imagine a scenario where your single web server is receiving millions and millions of HTTP requests per second, the CPU load is going insane, as well as the memory usage, when suddenly “crash!”, the server dies without saying good-bye (probably because of some weird hardware … Continue reading “Installing a high availability web server cluster on Ubuntu 12.10 using HAProxy, HeartBeat and Lampp”