#firewall
Every post tagged firewall.
Blog posts
How to Secure Proxmox VE After a Fresh Install: A Beginner's Hardening Checklist
A fresh Proxmox VE install works, but it isn't locked down. Here are the ten things worth doing first — from a real admin user to a firewall you won't accidentally lock yourself out of.
How to Set Up OPNsense as a Virtual Firewall/Router in Proxmox VE
Turn your Proxmox VE host into your router by running OPNsense as a VM. This guide covers WAN/LAN bridge planning, correct VirtIO NIC setup, the checksum-offload bug that silently corrupts traffic, and how to keep a way in if the firewall VM ever fails to boot.
How to Fix Network Problems in Proxmox VE (VM Has No Internet Access)
Your VM boots fine but can't reach the network. Here's the actual diagnostic order — bridge, guest IP, firewall, VLAN — that finds the real cause in Proxmox VE instead of guessing and reinstalling.
How to Configure the Proxmox VE Firewall (Datacenter, Host, and VM Rules)
A practical walkthrough of Proxmox VE's built-in firewall — datacenter, host, and VM-level rules, security groups, IPSets, and logging — with a rollout checklist that avoids locking yourself out.