Fayad Hossain Chowdhury

Virtualized dual-WAN router

pfSense, Debian, KVM/libvirt, Linux bridges, PPPoE, DNS

I am the systems and network administrator in my home, pfSense runs as a virtual machine on a Debian host. A network card is bridged to split the network into a main LAN and a separate access point subnet. Two ISPs share the load with weights, and a tiered failover group handles latency sensitive traffic.

The fiber link kept dropping

I ruled out the cables and hardware first, then read the PPP logs and found the provider was rejecting the login.

The upstream router blocked the virtual machine

Its MAC whitelist did not match the bridge. I found the mismatch and fixed it.

Browsing felt slow

I traced it to a slow DNS resolver handed out by one ISP’s DHCP.

Home server

Debian Linux, Docker, CasaOS, Bash

I run containerized apps, including Open WebUI, with Docker and CasaOS. Access is locked down with SSH key authentication and strict firewall rules.

Custom macro keypad

Arduino Pro Micro, C++ (QMK firmware), soldering

I built it from e-waste: an old keyboard chassis and switches, plus a Pro Micro controller. I hand-wired the key matrix and wrote the QMK firmware for shortcuts that speed up VS Code and server work.