EST. 2026 — Notes from real server work SYSADMIN · SECURITY · AI · DIRECTADMIN Issue 01
THE SYSADMIN ALMANAC
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NAT

#NAT

4 articles
Network / VPN
One Tunnel Is the Only Way In—and a Single Point of Failure
Network

One Tunnel Is the Only Way In—and a Single Point of Failure

The machine sits behind NAT with no ports open to the internet. Every way in runs through one cloudflared tunnel — web, SSH, and remote desktop. This article covers the four ingress routes I set up, how to read the signs when it goes down, and the trap that keeps the tunnel from starting at boot.

#cloudflare#cloudflared#tunnel#zero-trust
10 min read·5 Oct
Factory to Cloud Behind NAT: Push Snapshots and a Command Queue
Network

Factory to Cloud Behind NAT: Push Snapshots and a Command Queue

The production machine sits in a LAN behind NAT with no public IP, but the owner wants to view data on a cloud website and make edits from a phone that reach the internal machine — possible without opening ports or setting up a VPN, using push snapshots + an edit command queue + idempotent acks

#automation#networking#nat#api
10 min read·9 Aug
Put an Idle VPS to Work with WireGuard — A Complete Client Guide
Network

Put an Idle VPS to Work with WireGuard — A Complete Client Guide

Turn a VPS you signed up for on an annual plan into a WireGuard hub for accessing your home LAN anytime, without port forwarding — covering app installation, config imports, QR scanning, troubleshooting, and administration

#wireguard#vpn#vps#networking
12 min read·9 Jun
DA CentOS 7 → Debian 12 on Proxmox Part 1 — NAT pre-stage
DirectAdmin

DA CentOS 7 → Debian 12 on Proxmox Part 1 — NAT pre-stage

Preparing a new VM on an internal bridge with NAT while the old VM continues serving customers, reducing downtime when migrating DirectAdmin from CentOS 7 to Debian 12 on Proxmox.

#nat#proxmox#kvm#migration
11 min read·20 May