Debian 13 as a dual WAN router
Summary
This article describes turning a Debian 13-based N100 mini PC into a dual-WAN router using Ziggo (DHCP) and KPN (PPPoE with VLAN 6), including MTU tuning, per-line routing tables, and a nftables-based firewall/NAT. It also covers dnsmasq for local DNS/DHCP, dynamic DNS updates via TransIP, and a custom WAN failover script to keep services reachable on SMB networks. The write-up provides practical steps, testing tips, and future enhancements like IPv6 and load-balancing.