Linux, Windows, Security, Programming, Network Tutorials
A Computer Network is a group of computers connected to each other via a network. This network is used to transmit data between different computers. A computer in a network is called a node. Computer Network History Computer network history goes back to the 1950s where computers were so new. Below we will list some … Read more
Google is a huge company that provides paid and free services. It mainly operates in the IT and internet area. The Internet uses DNS in order to solve domain names into IP addresses. Because internet infrastructure works with IP addresses. Google provides free DNS servers that can be used for fast and free domain resolution. … Read more
New comers to the Linux generally asks for what is the purpose and usage of the /etc/hosts file. /etc directory holds system and service related configuration. hosts file is used to store host name or DNS to IP address resolution. It provides easy way to match a host or DNS name with an IP address. List Current … Read more
Hostname is used to identify the Linux hosts. We generally prefer to put related host names to the systems like web1, db5 etc. In this tutorial we will look how to find and print hostname and change it with different methods. Following examples can be used for other Linux distributions like CentOS, Fedora, RedHat too. … Read more
Tcpdump is everyday tool used by system and network administrator. We generally look simple use cases like host, port and protocol filter for tcpdump . In this tutorial we will look how to filter host, port and protocol in tcpdump. But keep in mind that tcpdump will requires administrator or root privileges. We can use root account … Read more
Nmap is popular tool used by pentesters, system administrators and network administrators. Nmap provides a lot of features for free. In this tutorial, we will look host discovery features and options of nmap. Discover with Ping Scan One of the basic usages for Host discovery is Ping scan. Ping uses ICMP protocol to communicate with … Read more
[rps-include post=6632] Performance is important part of the scan. Nmap developers always looks for optimized and adjustable performance options. Adjustable scan performance is important because scanning big networks will require a lot of time to complete job. As a security analyzer or pentester time is important for us. Set Host Group Count Nmap have the … Read more
[rps-include post=6632] Requirement for scanning is target specification. Nmap provides different methodologies to set targets. Single Host Address This is the simplest and mostly used target specification. We only provide single ip address. $ nmap 192.168.1.1 192.168.1.1 is the target ip address Dns Name Nmap can use DNS names as targets. It will resolve DNS addresses … Read more
DHCP is a protocol used to provide network related configuration to the network hosts. Mainly IP address information, network gateway, network mask and DNS server information are provided by DHCP protocol. DHCP have more features like providing boot file over network etc. In this tutorial we will look how DHCP reservation works for Windows Server … Read more
Virtualbox is virtualization tool used to create virtual machines. Virtual machines can be cloned, created, deleted without affecting any external source in the host system. In this tutorial we will look how to install Virtualbox virtualization software in Windows operating systems. Download VirtualBox We will download Virtualbox from following link. http://download.virtualbox.org/virtualbox/5.1.18/VirtualBox-5.1.18-114002-Win.exe Virtualbox have different versions … Read more