10 nmap Commands Every Sysadmin Should Know

Recently I was compiling a list of Linux commands that every sysadmin should know. One of the first commands that came to mind was nmap. nmap is a powerful network scanner used to identify systems and services. nmap was originally developed with network security in mind, it is a tool that was designed to find vulnerabilities within a network. nmap is more than just a simple port scanner though, you can use nmap to find specific versions of services, certain OS types, or even find that pesky printer someone put on your network without telling you....

 · 8 min · Benjamin Cane

Adding simulated network latency to your Linux server

Have you ever said to yourself, “man I really need to slow down my internet”? Probably not very often, but recently I found myself in a dilemma where I needed to simulate 120ms of network latency in my test environment which consists of servers that are racked right next to each other. That is where the command tc comes in. Within the current distributions of Linux there is a kernel component called netem, which adds Network Emulation and is used for testing and simulating the same types of issues one would see in a WAN (Wide Area Network)....

 · 3 min · Benjamin Cane