- ZeroTier: Build a Private Network and Fix the “Can’t Ping” Problem
- Debian 13 SR-IOV basics: why it fails and how to debug the first time
- Ubuntu 24.04: When GRO/LRO/TSO Offloads Break Things — How to Test and Disable Safely
- Ubuntu 24.04 “Connection reset by peer”: Prove whether it’s client, proxy, or server (case #14)
- Ubuntu 24.04: Netplan changes don’t apply — why (and how to make them stick)
- Ubuntu 24.04 “Network is unreachable”: routing table truth serum (and fixes)
- Debian 13: Network doesn’t come up after reboot — a no-fluff systemd-networkd checklist
- Office-to-office access control: enforce “only servers, not the whole LAN” rules
- Ubuntu 24.04 “No route to host”: ARP/gateway/ACL checklist that ends the guessing (case #32)
- Overlapping Subnets Between Offices: 3 Working Solutions Without a Rebuild
- Debian/Ubuntu “Connected, but no internet”: Routing, Gateway, and Policy Routing Fixes
- Debian 13 policy routing: debug ip rule and ip route without pain
- Debian/Ubuntu Random Timeouts: Trace the Network Path with mtr/tcpdump and Fix the Cause (Case #64)
- Ubuntu 24.04: VLANs don’t work — the one bridge flag most people forget
- Ubuntu 24.04: Resolv.conf Keeps Changing — Fix systemd-resolved/NetworkManager Properly
- Debian 13 Dual NIC Routing: Stop Asymmetric Routes and Random Drops (Case #53)
- Debian/Ubuntu: “Works on LAN, fails on WAN” — routing/NAT checks that reveal the cause (case #85)
- Debian 13 MTU/MSS Mismatch: Why Large Files Stall and How to Fix It Cleanly
- Ubuntu 24.04: sudo is slow — DNS/hostname fixes that remove the delay (case #6)
- Ubuntu 24.04: Reverse path filtering — the hidden setting that breaks multi-homing (case #54)
- Ubuntu 24.04: Jumbo frames break “only some” traffic — how to test and fix MTU safely
- Debian/Ubuntu Random Timeouts: Trace the Network Path with mtr and tcpdump (Case #4)
- Ubuntu 24.04 Bridge/VLAN for Virtualization: Fix “VM Has No Internet” the Right Way
- Two offices on 192.168.0.0/24: connect them without renumbering
- Ubuntu 24.04: IPv6 Breaks Random Sites — Fix Dual-Stack Properly (Don’t Just Disable IPv6)
- Ubuntu 24.04: TLS handshake failures in curl — SNI/CA/time quick fix checklist
- Debian 13 “Could not resolve host”: DNS/proxy/IPv6 — the fastest triage path
- Debian/Ubuntu “Works on LAN, fails on WAN”: Routing and NAT checks that reveal the cause (case #25)