How To Use TCP Wrappers For Network Service Security On Linux
Learn about TCP wrappers and how they can be used to secure network services running on a Linux server in this tutorial.
How to: Secure My Network in Linux - Page 3
Find the HOWTO or step-by-step guide that you need right here.
How to Find and Remove Malicious Cron Jobs on Linux
A compromised Linux server can continue running malware long after the initial intrusion. One of the most common persistence techniques is a malicious cron job that silently downloads payloads, restarts malware, or re-establishes attacker access ever...
How to Harden SSH on Linux After Disabling Password Authentication
Most SSH hardening advice ends at the same recommendati...
How to Detect Unauthorized SSH Keys on Linux Systems
Most of the time, nobody notices. SSH authentication su...
How To Monitor Network Activity For Troubleshooting And Security
Whether you are troubleshooting a network issue or verifying the security of your network, monitoring network activity is crucial to maintaining a secure Linux system. Learn about multiple great methods for monitoring network activity on a Linux system in this LinuxConfig tutorial.
20 Essential Nmap Commands for Improving Network Awareness and Insight
Nmap is an awesome open-source network discovery and reconnaissance tool that can be used to improve network security by revealing detailed information about target hosts and identifying potential vulnerabilities. Learn about 20 helpful nmap commands in this LinuxTechi guide.
Secure Your Work-From-Home Network: Eight Essential Tips
Learn how to secure your work-from-home network and protect your privacy in eight simple steps.
Port Redirection in Linux Using Ncat for Network Debugging
Ncat is essential for Linux network debugging and troubleshooting, and this powerful tool delivers a "useful, but potentially dangerous, option for creating a port redirection link". Learn how to set up port redirects with ncat in this tutorial.
Effective Tcpdump Filtering Techniques for Network Data
Learn to use tcpdump's filtering capability to make it easier to make sense of your network data in this quick, informative tutorial.
Become Proficient in Tcpdump for Superior Network Troubleshooting Skills
Tcpdump is a valuable network utility that can be used for troubleshooting and debugging. This article demystifies tcpdump - examining its options, as well as a real-world use case, for debugging networking issues in your Linux environment.
How To Restrict Network Access Using Firewalld On CentOS And RHEL
As a Linux user, you can opt either to allow or restrict network access to some services or IP addresses using the firewalld firewall which is native to CentOS/RHEL 8 and most RHEL based distributions such as Fedora. Learn how to do this in a helpful tutorial.
Network Troubleshooting with Packet Captures: Insights and Safety
Capturing network traffic packets provides insight into what's happening on your network - but you don't want just anyone to do it. Learn how to safely capture packets in this article.
Comprehensive OpenVPN Setup Guide for CentOS 8: Follow the Steps
OpenVPN is an open-source application that allows you to create a secure private network over the public internet. OpenVPN implements a virtual private network (VPN) to create a secure connection. OpenVPN uses the OpenSSL library to provide the encryption and it provides several authentication mechanisms, such as certificate-based, pre-shared keys, and username/password authentication. Learn how to install OpenVPN with Easy-RSA 3 on CentOS 8:
How Deception Technology Improves Early Threat Detection
Are you aware that deploying automated decoys can help protect your network and reduce IT costs?
10 Steps To Secure Your Business WiFi Network Against Threats
Conducting regular maintenance and updates are the easiest ways to secure your corporate WiFi network.
Build A VPN Server With Raspberry Pi For Personal Network Security
In 2019, is there anything that the mighty, $35, credit card-sized Raspberry Pi computer can't do? It seems there isn't; recent Raspberry Pi projects include a functional smartphone, a computer vision kit, and even a movie projector for a more traditional home theater experience.
Boost Your Network Security by Utilizing Firewall-Cmd on Linux
Firewalls are a vital part of network security, so it’s important for a sysadmin to be familiar with how they work. If you understand firewalls, you can keep your network secure by making intelligent choices about the traffic you allow in and out.
Securing Edge Devices Against Threats: Protect Your Network
We spend a lot of our online time out and about these days, using our mobile phones and connecting over cellular networks or public Wi-Fi…
Debugging Network Problems With Oracle Linux: Tools And Tips
Shannon Nelson from the Oracle Linux Kernel Development team offers these tips and tricks to help make host network diagnostics easier. He also includes a recommended playlist for accompanying your debugging!
Creating A PriTunl VPN With Raspberry Pi 3B+: Efficient Network Access
PriTunl is a fantastic VPN terminator solution that's perfect for small businesses and individuals who want a quick and simple way to access their network privately. It's open source, and the basic free version is more than enough to get you started and cover most simple use cases.
Nagios Monitoring Configuration Guide for System Administrators
Learning Nagios 3.0 is a comprehensive configuration guide to monitor and maintain your network and systems. It is a practical guide to setting up the Nagios 3.0 open source network monitoring tool, installing and configuring Nagios 3 on various operating systems. It will help understand system monitoring and how Nagios works. Nagios 3 is a system that watches to see whether hosts and services are working properly, and notifies users when problems occur. Nagios allows both the monitoring of services on its own, and the receipt of information about computer and service statuses from other applications. Nagios constantly checks other machines on your network and various services on those machines. It is a modular and flexible solution that uses plug-ins to do its job.
Assistance Required for Creating Snort Rules to Generate Traffic Alerts
I need some help in writing snort rules for the following, I have never done this before, can someone please help me. Thanks 1. (1 point) Write a Snort rule that will alert on TCP traffic exiting the 10.0.1.0/24 network with the content "proprietary". I do not care where the traffic is going or what ports it is using. When Snort creates the alert it should read "Proprietary information leaving!" 2. (1 point) Write a Snort rule that will log any TCP traffic entering into the 192.168.100.0/24 and 10.2.2.0/24 networks with destination ports 1 through 1024. I do not care about the source IP addresses or source ports. When Snort logs the traffic it should read "Incoming to low ports". 3. (1 point) Write a Snort rule that will alert on UDP traffic entering the 192.168.10.0/24 network that contains the content "cgi-bin" anywhere between the 5th byte offset to the 25th byte offset. The alert should trigger on both lowercase and uppercase content. I do not care about the source ports or destination ports. When Snort creates the alert it should read "UDP CGI exploit".
Examining Nmap: A Key Tool for Network Security in Enterprises
So when many people think of Nmap, it is often related to those who are new or learning in the world of scanning and tracking network ports. It's open source. It's easy to use (with a GUI). It has a full community of friendly users, plays well with friends, is good with children and even makes cupcakes at parties (okay maybe not those last few). The point is, the reality may not always be apparent; that Nmap provides some serious, enterprise, #&$#!-kicking functionality. And while we tend to avoid pushing specific papers or How-tos that cost money, this paper we found brought up a nice point considering that Nmap is, in fact, our Open Source Tool of the Month. So if you were curious as to whether Nmap is serious enough to warrant charging for a how-to, (without shame that is) check this out. Could you find this information elsewhere? Probably. Is it as good? We don't know, we didn't buy it :) Is it easier to understand and follow, especially for someone in a business environment? Just maybe. Either way, when push comes to shove, it's nice to see an open source tool get some attention. And who knows? If there's some company manager that doesn't trust Nmap's functionality, maybe a paid analysis of its utility could go farther in convincing them than some free how-to you found online (even from such a trustworthy, experienced site such as this :) Fair is fair, and heck, its food for thought.
Powered By
Linux Security - Your source for Top Linux News, Advisories, HOWTOs and Feature Releases
QUICK LINKS
subscribe to newsletters!
Like staying secure? So do we.
Sign up for updates, tips, and alerts!