Glossary infra Term Page

Firewall

A rule-based boundary layer that allows or blocks network traffic

firewall #networking#opnsense#proxmox

Korean version

Aliases

firewall policy

Prerequisites

Bridge Network

Related Concepts

NAT Reverse Proxy Subnet

Core Idea

A firewall is the boundary layer that decides which traffic may pass and which must be blocked. It is not just a device that says "no"; it is the policy point that separates public services, private services, and management paths.

Why It Matters Here

Mathbong uses firewalls as the hub that connects OPNsense, Proxmox, and VPN design. No matter where a service runs, the final question is which rule set controls the boundary around it.

Posts Mentioning This Concept

[OPNsense Series Part 1] What OPNsense Is and Why It Pairs So Well with Proxmox Learn what OPNsense handles as a firewall, router, and VPN gateway, and why it works so well alongside Proxmox in self-hosted infrastructure.[OPNsense 시리즈 1편] OPNsense는 무엇이고 왜 Proxmox와 조합이 좋은가 OPNsense의 방화벽·라우팅·VPN 역할을 정리하고, Proxmox 위에 올렸을 때 어떤 구조와 장점, 한계가 생기는지 설명합니다.[Proxmox Series Part 7] Designing Networks with Bridges, Private Segments, and VPN Start with the default vmbr bridge, then plan private networks, OPNsense placement, VPN-based remote access, and decide what to expose versus keep hidden.