The Firewall Rule Order That's Breaking Your Setup
Firewall rules are evaluated top-down, first match wins. One misplaced ALLOW rule silently defeats all security.
Tag: networking
All the articles with the tag "networking".
Is fail2ban Actually Working? Here's How to Check
Verify fail2ban is protecting you: check jails, test bans, monitor logs, common misconfiguration, and unban IPs when needed.
SSHFS: Ditch SCP & Access Remote Files
SSHFS mounts remote filesystems over SSH so you can browse and edit files locally — faster than scp for interactive work.
Why Your SSH Connection Keeps Dropping
Fix SSH timeouts: ServerAliveInterval, ServerAliveCountMax, ClientAliveInterval. Understand NAT, firewalls, and TCP keepalive.
ss Is the New netstat (And It's Better)
netstat is deprecated. ss is faster, shows more, and does everything netstat did—better.
Docker Network Aliases: The Feature Nobody Uses
Network aliases give containers multiple DNS names. Perfect for blue-green deploys and service discovery patterns.
lsof: The Tool That Shows You Everything
Master lsof to find port conflicts, trace deleted files eating disk, and debug network connections.
Finding the PID of a Process Using a Specific Port in Linux
Something's squatting on port 8080 and you need to know what. ss, lsof, and fuser one-liners to find and kill the culprit fast.
The Role of Antivirus and Endpoint Detection and Response Systems
AV vs EDR — traditional antivirus signatures vs behavioral endpoint detection. What each catches, what it misses, and what you actually need.
Certificate Pinning: A Secure Connection Guide
Certificate pinning locks your app to a specific TLS cert so MITM attackers can't swap in a rogue CA — how it works and when to use it.
Docker Networking Essential Guide for All Skill Levels
Bridge, host, overlay, macvlan, and none — every Docker network mode explained with real use cases from beginner to production.
Docker Strategies for Load Balancing and Failover
Add load balancing and failover to your Docker setup using Swarm, nginx, HAProxy, and Keepalived — high availability without Kubernetes.