Monday, August 19, 2019
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How to enable Secure Shell (SSH) server on OPNsense

In this tutorial, we are going to learn how to enable ssh server on OPNsense. So you have installed OPNsense and can be able to login via web gui but login via ssh is timing out? # ssh -v [email protected] OpenSSH_7.2p2 Ubuntu-4ubuntu2.4, OpenSSL 1.0.2g 1 Mar 2016 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug1: Connecting to 192.168.10.23...

How to Configure Static IP Addresses on Ubuntu 18.04 Server using Netplan

In this tutorial, we are going to learn how to configure static IP Addresses on Ubuntu 18.04 server using netplan command. To manage network interfaces, Ubuntu 18.04 uses the NetPlan utility. The NetPlan command has replaced the commonly used static interfaces configuration file, /etc/network/interfaces, with various network configuration files in the /etc/netplan/ directory. The files in this directory are in...

How to Enable Ping response On IBM QRadar SIEM

In this tutorial, we are going to learn how to enable the ICMP ping response on QRadar SIEM. So you have installed IBM QRadar SIEM and trying to verify its connectivity using ping command but you realized that ping icmp requests are  being dropped? Well, this happens because by default, QRadar SIEM drops all ICMP traffic received on the management...

How to check Hardware information, block devices and filesystems on a Linux System

In this tutorial, we will learn how to check hardware information, block devices and filesystems on Linux system. Many a time as we interact with the Linux system in our day to day activities, there may arise a need to check on the mounted filesystems, available block devices, disk space usage, system hardware information or even file space usage. Well,...

Viewing System Processes using ps and top commands

When commands are run on a system, various processes associated with them are created. Among the roles of a system administrator, being able to determine what processes are running, monitor and manage them is a critical skill. There are several program tools that can be used to achieve this. In this tutorial, we are going to explore some of...

How to Install and Configure NFS Server on RHEL/CentOS 7

In this tutorial, we will learn how to Install and Configure NFS Server on RHEL/CentOS 7. Network File system (NFS) is a commonly used file-based storage system that allows remote systems to access files over a computer network and interact with them as if they were locally mounted. This enables system Administrators to group resources onto centralized servers on a...

How to Create an LVM Logical Volume

In this tutorial, we are going to learn about how to create LVM logical volumes. Before we dive deeper, let us have a look at LVM architecture. LVM ARCHITECTURE OVERVIEW The structure of an LVM disk environment is simply illustrated in the figure below. LVM Logical Volumes Components The underlying structure of an LVM environment is a block device such a partition or...

How To Reset Or Recover Root Password On OPNsense

So for some reason you just forgot the root password for your OPNsense router/firewall and you are now locked out and dont know what to do!!? Relax as in this article, we will show you How To Reset Or Recover Root Password On OPNsense from single user mode. You can also check our previous guide on how to install OPNsense...

How to Install OPNsense on VirtualBox

In this tutorial, we are going to learn how to install OPNsense on VirtualBox. OPNsense is a FreeBSD-based open-source and a fork of pfSense software that provides firewall and routing features. It is developed by Desico, a Company in Netherlands. Some of the common features offered by OPNsense include: Traffic Shaping Forward caching proxy Intrusion detection and Prevention Two-factor authentication ...

How to Fix QRadar CE failing Gluster 3.8 repos on CentOS-7.3

In our previous article, we learnt how to Install IBM Qradar Community Edition on VirtualBox. Installation of QRadar CE 7.30 on CentOS 7 may fail with the error "One of the configured repositories failed (CentOS-7 - Gluster 3.8) and yum doesn't have enough cached data to continue". As a result, this guide presents a simple way on how...