BanD Width! It’s MyBOND!!
My workstation in my univerity lab has consistently generated some 600 TiB of annual upload across two PT sites. After an upgrade to the room a few months back, it received the most wanted upgrade ...
Why my IPv4 gets stuck? - Debugging network issues with bpftrace
I run a Debian-based software router on my home network. It’s connected to multiple ISPs, so I have some policy routing rules to balance the traffic between them. Some time ago, I noticed that the ...
Driving pppd with systemd
I moved my soft router (Intel N5105, Debian) from school to home, and at home it’s behind an ONU on bridge mode, so it’ll have to do PPPoE itself.
My firewall solution for RDP
Today I stumbled upon this V2EX post (Simplified Chinese) where the OP shared their PowerShell implementation of a “makeshift fail2ban” for RDP (their GitHub repository). Their script looked very c...
Debugging Proxmox VE Firewall Dropping TCP Reset Packets
A few days back when I was setting up a new VM to host some extra websites, I noticed an unexpected Nginx error page. As I don’t administer the new websites, I just added reverse proxy rules on the...
Running a dual-protocol OpenVPN/WireGuard VPN server on one port
Public Wi-Fi and some campus network typically block traffic from unauthenticated clients, but more often allow traffic targeting UDP port 53 to pass through, which is normally used for DNS queries...
My automated Daily Health Report infrastructure
Back in the days when the Zero COVID policy was prevailing, our university introduced a Daily Health Report system. Students and faculty were mandated to submit a daily online form detailing their ...
Secure site-to-site connection with Linux IPsec VPN
Linux has a built-in framework for Internet Protocol Security (IPsec), which is often combined with other tunneling technologies (e.g. L2TP and GRE) to create secure cross-site network connections....