The MAC address can be temporary changed with ifconfig, iproute2 or the macchanger tool, in Debian, Ubuntu, Linux Mint or other Debian based distros. How can I find local IP addresses i. Python platform independently and using only the standard library Learn how to assign multiple IP addresses to a virtual machine using the Azure commandline interface CLI. Symantec Endpoint Protection Manager Symantec Endpoint Protection. Linux Network Configuration Networking, setup and administration. This Linux tutorial covers TCPIP networking, network administration and system configuration basics. Feed aggregator of hand picked System Administration, Information Technology, and Information Security related blogs. In the 1st part of the IP Routing series, we learned the fundamentals of Linux IP Routing. Route command is used to showmanipulate the IP routing table. I. At MakeUseOf, we cover Linux quite a bit as the alternative to Windows and Mac OS X. However, those arent the only three operating systems out there. In this tutorial I will configure a virtual host with the hostname lists. I will install Mailman. Simulating Slow Internet Connection. You can use Net. Em Network Emulation as a proxy server to emulate many network characteristics speed, delay, packet loss, etc. It controls the networking using iproute. HOW-TO-INSTALL-GOOGLE-CHROME-IN-UBUNTU-16.04.jpg' alt='How To Install Iproute2 Ubuntu' title='How To Install Iproute2 Ubuntu' />Linux distributions. It is controlled by the tc command line application from the iproute. GUIs for Net. Em, for example PHPnetem. GUI2. The advantage is that, as I wrote, it can emulate not only different network speeds but also, for example, the packet loss, duplication andor corruption, random or defined delay, etc., so you can emulate various poorly performing networks. For your application its absolutely transparent, you can configure the operating system to use the Net. Em proxy server, so all connections from that machine will go trough Net. Em. Or you can configure only your application to use it as a proxy. I have been using it to test the performance of an Android app on various emulated poor performance networks. How to install and configure Nagios on Linux. Nagios is one of the most powerful network monitoring systems, which is widely used in the industry. It can actively monitor any network, and generate audioemail warnings and alerts when any problem is detected. The check types and alert timers are fully customizable. Another incredible capability of Nagios is that it can monitor both hosts and services e. IP addresses and TCPUDP port numbers. To explain a little, let us assume that there is a web server that we want to monitor. Nagios can check whether the server is online by running ping on the IPname of the server as well as it can be set up to provide warnings in case the round trip time RTT to the server increases. Further, Nagios can also check whether TCP port 8. ApacheIIS is not responding. There are also 3rd party monitoring tools that are based on Nagios, such as Centreon, FAN, op. Monitor, which supplement standalone Nagios engine in terms of interface, automation, and technical support. This tutorial explains how to install and configure Nagios on Linux. Install Nagios on Debian or Ubuntu. On a Debian based system, the installation in itself is a very simple process thanks to apt get. The mail server setting can be done during Nagios installation. It can also be configured later when needed. Note A valid SMTP configuration is needed for Nagios to be able send email notifications. As it can be seen, Nagios supports multiple options for email delivery. The most common options would be Internet Site where the server sends email directly to the recipient. Another widely used option is using smarthost or relay server, in which the server sends the email to an intermediary mail server which in turn is responsible for delivering the mail to the recipient. Next, the domain name of the server has to be included in the next step. Finally, the password for the Nagios admin user nagiosadmin is set. This value can also be changed later. Install Nagios on Cent. OS or RHELyum is used for installation. After setting up the repoforge repository, run yum as follows. Requirements for Monitoring. In this tutorial, we want to monitor the following. All Linux server will be checked every 3 minutes. All Cisco Routers will be checked every 3 minutes. All email alerts should go to the address sentinelexample. Nagios will verify 3 times before sending out any alerts just to be sure that the problem is real. If the RTT to any device exceeds 1. The rest of the tutorial will guide you to configure Nagios on Linux. Nagios Configuration on Ubuntu. It is important to know where Nagios configuration files are located. The following table shows the location of Nagios configuration files on Debian based systems. Customizable scripts used for monitoringetcnagios. Configuration files to add hosts, services, define checks and timersusrlibnagiosplugins. Executable files used for monitoring. The following steps are inter related. Hosts, groups for hosts and adding services to host groups are defined. Adding Host Template. The templates defining what to do with a type host is defined. Download After Effects Free For Windows Xp. We use the files provided with the installation as sample. First, define a host template for Linux devices. Edit linux server. The parts with bold font are modified. Next, define a host template for Cisco devices. Modify cisco device. The bold font parts are modified. The highlighted parts are modified. Adding Host. Now that the host template is defined, the actual host to be monitored is added. Again, the files provided by default are used as sample. Name of host template to use. The hostname to be used by nagios. The IP address of the host. Name of host template to use. The hostname to be used by nagios. The IP address of the host. Host Group Definition. For ease of management when there are multiple hosts, it is advisable that hosts of similar types are grouped together. Linux Servers. membersour server comma separated list of members. Cisco Devices. membersour server comma separated list of members. Service Definition. First, the command example host check is defined with warning value of 1. Critical values are 5. One IPv. 4 ping request is transmitted. H HOSTADDRESS w 1. Then, the command is associated with host groups. Linux Servers. checkcommand example host check. Cisco Devices. checkcommand example host check. Contact Definition. The required address for sending email added to Nagios. The Design Of Microstrip Patch Antenna With Four Polarizations. Root. servicenotificationperiod 2. Finally, a dry run is initiated to check whether there are any configuration errors. If there are no errors, Nagios can be restarted safely. Nagios Configuration on Cent. OSRHELThe following shows the locations of Nagios configuration files on Redhat based systems. Configuration files to add hosts, services, define checks and timersusrlibnagiosplugins. Executable files used for monitoring. Adding Host Template. A template is created to define what needs to be done for a specific type of host. The files provided with the installation is modified. Adding Hosts and Host Groups. The configuration file provided with by default is used as a sample. The hosts and host groups are added in the same file. Adding Linux server. Adding Cisco Router. HOST GROUP DEFINITION. Autocad Lt 2000I there. Linux Servers. members our server. Service Definition. A service called example host check is defined with warning values of 1. The critical values are 5. Only one IPv. 4 ping request will be transmitted. USER1checkping H HOSTADDRESS w 1. Contact Definition. The email address where alerts will be sent is added into Nagios. Nagios Admin. emailnagioslocalhost, sentinelexample. Finally, we are ready to start the Nagios service. A dry run is recommended to find out errors in configuration. Access Nagios after Configuration. Now you are ready to use Nagios. Nagios can be accessed by opening the URL http IPnagios. UbuntuDebian or http IPnagios in case of Cent. OSRHEL e. g. http 1. The user nagiosadmin needs to be authenticated to access the page. Troubleshooting Nagios. When Nagios is not running the way it is supposed to, the first thing to do would be to initiate a dry run. On Debian or Ubuntu. On Cent. OS or RHEL. The log file may also shed some important clue. The path to the log file is located at varlognagiosnagios.