Network Security
system security Linux network
system security Linux network The romanticized image of the digital nomad – a laptop on a sun-drenched balcony – rarely accounts for the actual friction of maintaining a professional development environment on the move. . The friction is amplified with Linux. We are looking for a setup that respects our kernel configurations, handles volatile network handovers, and maintains a strict security posture without the hand-holding of a consumer-grade OS – so, put simply, more than just a laptop and a sunny deck. The hardware is...
May 26, 2026
Server Securityopen-source Linux administration
open-source Linux administration Cron has existed in Unix and Linux environments for decades, handling backups, cleanup scripts, patching jobs, log rotation, monitoring tasks, and other maintenance work that administrators do not want to run manually. Most Linux servers rely on it constantly, which is exactly why attackers continue abusing it for persistence after a system has already been compromised. . Persistence through cron is not complicated. Attackers do not need a rootkit or advanced malware framework to maintain...
May 25, 2026
Vendors/Productssecurity breach linux
security breach linux A major internal repository breach at GitHub has exposed a critical and overlooked blind spot in Linux supply chain security. Kernel exploits, exposed SSH services, weak firewall rules, and vulnerable daemons dominated the Linux threat model for years, and in many environments, they still matter. But recent supply-chain incidents involving GitHub ecosystems, npm packages, and malicious developer tooling point somewhere else entirely: the developer workstation. . The breach matters because...
May 21, 2026
Security Trends access control multi-tenant
access control multi-tenant Linux administrators often face an ugly choice in the cloud: prioritize convenience and cost-efficiency by sharing infrastructure, or sacrifice those benefits for the sake of total isolation. Most modern Linux workloads don't live on their own private servers anymore. They live in shared environments like Kubernetes clusters, where multiple teams and services run side-by-side. It sounds efficient, and it usually is. . But cloud isolation isn't as ironclad as it looks on the diagram. If you...
May 21, 2026
Vendors/Productsincident response cloud security
incident response cloud security Managed Extended Detection and Response (MXDR) has become one of the most sought-after security services in the enterprise market — and with good reason. It promises the holy grail: broad visibility across endpoints, network, cloud, email, and identity, combined with the 24/7 human expertise most organizations simply cannot build in-house. . However, the rapid growth of the market has produced a wide range of providers whose capabilities vary considerably beneath the surface. Choosing the...
May 19, 2026
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72
network securityintrusion detectionsecurity insightsEngaging Insights From Michael Rash On Linux Security And Firewalls
Michael Rash, the author behind "Linux Firewalls" chimes in about his background, his distro of choice, the current state of Linux security and much, much more. He covers many issues and provides a lot of insight into security and Linux: Question: What is the most interesting fact you've become aware of while researching for this book? Intrusion detection systems and firewalls commonly offer the ability to tear down TCP connections by forging a RST packets, but the specifics of how this is done varies quite a bit across different IDS and firewall implementations. The most interesting fact I stumbled across during my research concerns differences in the handling of the ACK control bit on RST packets. For example, . The link for this article located at Net-Security.org is no longer available. . The link for this article located at Net-Security.org is no longer available.. michael, author, behind, 'linux, firewalls', chimes, about, background, distro. . Brittany Day
Nov 12, 2007
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Firewalls
72
access controlnetwork protectionserver securityEnhancing Server Security Through Firewalls And Access Controls
We recently had a situation in which one of our servers was accessed by someone from another building/floor who had no need to get into the system. Part of the problem was that someone left their username/password out in plain sight; that problem has been fixed. . . .. "We recently had a situation in which one of our servers was accessed by someone from another building/floor who had no need to get into the system. Part of the problem was that someone left their username/password out in plain sight; that problem has been fixed. Management is concerned that our more sensitive servers may not be as protected as they should be. We already have one firewall protecting our Internet connection. Should we look at an additional firewall to protect the servers that management is concerned about?" A little more protection is always a good thing. There are two ways you can approach this. Depending on what type of a core switch/router you are using, you can restrict access to certain systems by using Access Control Lists (ACL) in the switch/router. While this is doable, you also should think about limiting the port numbers that the designated systems can be reached with. This, too, can be done with ACLs. Something to think about is keeping this information backed up in a safe place, as if you have to replace the system, you'll need to replace that information to keep the same level of protection. Another option is an interior firewall. Using more than one firewall is becoming commonplace on networks today as controlling access to designated systems is becoming more important. While Linux-/Unix-based systems come equipped with their own firewall functionality built in, why maintain a firewall setup on each system when you can centralize the management? One argument I frequently hear is whether to use the same brand of firewall for your second interior router or a different brand. There is some validity to this question. Look at it from this perspective: Would you rather have to learn two different interfaces to manage twofirewalls or use just interface to manage two firewalls? One reason for using different brands of firewalls is that if one gets compromised, the hacker/intruder has to pretty much start all over again to try and get past the second. Look at the vulnerabilities reported by the vendor and the security community on the firewall you're currently using. Compare this against the other firewalls you consider. See which has had the most problems and how quickly they were resolved. The link for this article located at Ron Nutter is no longer available. . Protecting data centers demands methodical positioning of firewalls and stringent access regulations to bolster overall network safety.. Firewall Protection, Server Security, Access Control, Network Security. . Anthony Pell
Oct 15, 2004
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Firewalls
72
network securitydata protectionaccess controlAccess Controls Reimagined: Moving Beyond Traditional Firewalls
This article is a good discussion about what a firewall can be expected to do, and what it can't. "In most organizations, firewalls are now a commodity: everyone has at least one. In the future, access controls will need to become . . . . This article is a good discussion about what a firewall can be expected to do, and what it can't. "In most organizations, firewalls are now a commodity: everyone has at least one. In the future, access controls will need to become more granular, all the way down to the data level. .. Historically, many technologists took the view that a firewall was security-a terrible misconception, but widely perceived as true. The idea was supported by another misconception: that if you protected your perimeter network with a firewall, you were inherently protecting the data on your internal network. Accordingly, the only business requirement was to protect the network. Systems administrators set up accounts on individual systems, of course, but most technology managers contented themselves with the thought that the perimeter network provided all the protection they needed. " . Firewalls are essential but not a standalone security solution. Organizations must combine them with layered defenses and access controls to truly safeguard against evolving threats. Access Control, Firewall Strategies, Network Security. . Anthony Pell
Sep 17, 2000
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Firewalls
72
network securitysecurity managementfirewall12 Essential Tips For Building Network Firewalls and Security Policies
Here's a quick 12 tips that describes a firewall, and how to build one. 1.A firewall implements your security policy. A firewall enforces some security policy. If you didn't have a security policy before you put the firewall in place, you . . . . Here's a quick 12 tips that describes a firewall, and how to build one. 1.A firewall implements your security policy. A firewall enforces some security policy. If you didn't have a security policy before you put the firewall in place, you do now. It may be unwritten, but it's still a security policy. If you haven't made explicit decisions about what you want the security policy to be, it's probably not the best policy for your site, and it will certainly be difficult for you to maintain it over time. In order to have a good firewall, you need a good security policy--one that is written down and widely agreed to. 2.A firewall is not usually a single device. Except in the most simple of cases, a firewall is seldom a single device; it is usually a collection of devices acting in concert. Even if you buy a commercial "all-in-one" firewall appliance, you'll still have to configure other machines (your public web server, for example) to work along with it. And these other machines should really be regarded as part of the firewall. This has all sorts of implications for how you configure and manage these machines, what they trust, what trusts them, and so on. You cannot simply choose one box, call it "the firewall," and expect it to assume all responsibility for security. . Evaluate your organization's security needs to tailor your firewall solutions, ensuring a cohesive, multi-layered defense to mitigate threats effectively. Firewall Construction, Network Security Strategies, Security Policy Implementation, Firewall Management. . Anthony Pell
Jul 29, 2000
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Firewalls
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