Tagged: firewall

27 August 2026 Windows Linux Networking PowerShell Firewall Security

Same Job, Different Shell Part 9: Firewall Status, Read-Only

iptables -L, nft list ruleset, and ufw status against Get-NetFirewallRule and netsh advfirewall show: reading what a firewall currently allows without touching a single rule. Part 9 of the Windows/Linux command comparison series, and the natural next step after a port test comes back filtered.
27 April 2026 Fortinet FortiManager FortiGate Proxmox Lab Firewall

Building a FortiManager Lab on Proxmox — Part 4: A Lab Edge FortiGate VM in Front of FortiManager

Part 4 of the FortiManager-on-Proxmox series. Builds a FortiGate-VM as the lab edge in front of FortiManager, with four NICs mapped to the lab bridges, a scoped policy set, FortiGuard pinhole, local-in policy hardening, and the deny-with-log rule that proves the boundary works.
26 April 2026 linux networking iptables nftables firewall security migration

iptables to nftables: Migrating Production Firewalls Without Downtime

A working engineer's guide to moving from iptables to nftables on production Linux firewalls — the mental model shift, where iptables-translate misleads you, atomic ruleset swaps, and a clean rollback strategy that means a bad migration costs you seconds, not your weekend.