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Keep this in mind that when you try to do operating-system scans fors subnets with many hosts, since it might take awhile to get the results back. In saying that, I would like to further explain the utility commands for you to follow along at your own pace. How can you get access to a Linux console If you are new to Linux, there are many options to gain access to a Linux box for free (or at a very low cost): Mac OS: if you are a Mac user all you have to do is a open a terminal window. The operating system itself is based on Unix, which is a close cousin to Linux. Windows 10: you can use Linux-like environments such as Cygwin. In addition, in 2016, Windows 10 started supporting Linux as a native application. Cloud Linux: most major cloud providers like AWS, Azure, GCP, have free-tier offerings that you can use to spin up a Linux box in the cloud. Linux box: if you want to have your own Linux box, considerinvesting 50-100 on a single board computers such as the Raspberry Pi, Odroid, or Beaglebone. All of the utility examples below were performed on Debian-based Linux. Note: If you are using some other distribution, things might be slightly different. The first thing that you need to do for each command is to install it on the OS (if its not installed already). Go To Webinar Client Update And VerifyThe NMS, also called SNMP poller, periodically requests each device utilization values of its resources to get a status update and verify that its working properly. ![]() An SNMP agent uses port UDP 161 to receive requests from a poller. SNMP can also be used to apply configuration changes to devices and, if needed, to send notifications, called traps, to an SNMP trap receiver when an event that requires administrative attention happens on the device itself. An SNMP trap could be generated if, for example, the network interface of a router goes down or if a BGP neighbor becomes unreachable. Nmap (1997) Nmap stands for network mapper its mainly used for network security scans. The nmap ping sweep scans a subnet for any available hosts; its one of the most basic commands you can run. If I scan a specific host I get the following details which include open port information. A common use case for nmap is to scan a network before and after a change to make sure that all hosts are connected back to the network after the change. Here is a one-line bash loop that runs the ping sweep command every 5 seconds. For each one of these utilities you can get detailed information about their capabilities and options by reading their manual. The manual can be difficult to read and might be complicated for novice users, in which case, you can find tons of tutorials and guides online. ![]()
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February 2021
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