Firewalls and the OSI Model: What a Firewall Actually Reads in Your Packets

Fri, 14 Aug 2026 00:00:00 +0000

Un pare-feu ne « bloque » rien en bloc : il lit des en-têtes, couche par couche, et chaque couche autorise un type de filtrage différent. Tour d’horizon de la couche 2 à la couche 7, avec pfSense comme cas d’école.

The OSI Model, Layer by Layer

Sat, 18 Jul 2026 00:00:00 +0000

This series breaks down the network layer by layer, from the cable all the way to the application. Seven layers, six articles, always the same promise: no theory for theory’s sake. Each layer comes with the commands that go with it, the failures it causes, and how to diagnose them—all tailored for those preparing for the TSSR professional certification or who simply want to understand what’s really going on under IP.

Reseau on Aperture Zone

Firewalls and the OSI Model: What a Firewall Actually Reads in Your Packets

The OSI Model, Layer by Layer