Understanding Firewalls: State Filtering, Deep Packet Inspection, and Security Zones

This article explains how firewalls act as barriers between trusted and untrusted networks, covering placement, stateful vs. stateless filtering, deep packet inspection at layer 7, security zones, ACL configuration, and the role of DMZs in protecting internal resources.

ACLdeep packet inspectionfirewall

0 likes · 9 min read

Understanding Firewalls: State Filtering, Deep Packet Inspection, and Security Zones

Liangxu Linux

Jun 11, 2023 · Information Security

Understanding Firewalls: Stateful Filtering, Deep Packet Inspection, and Security Zones

This guide explains how firewalls protect networks by using stateful filtering, deep packet inspection of application-layer data, and security zones such as inside, outside, and DMZ, illustrating configuration examples, ACL usage, and best‑practice traffic control.

DMZdeep packet inspectionfirewall

0 likes · 8 min read

Understanding Firewalls: Stateful Filtering, Deep Packet Inspection, and Security Zones

Practical DevOps Architecture

Nov 12, 2020 · Information Security

Configuring a USG to Enable Internal Users to Access the Internet via WAN

This guide details the step‑by‑step configuration of a Huawei USG firewall, including WAN interface setup, static routing, NAT and security policies, and LAN DHCP and zone settings, to allow a trusted internal network to reach the untrusted Internet.

DHCPNATUSG

0 likes · 5 min read

Configuring a USG to Enable Internal Users to Access the Internet via WAN