So some of these might actually be one of the oldest #fastd VPN keys ever. As @neocturne had started that whole fastd project back then here at @ffhl and even wrote (bachelor?) theses on it. To have a VPN solution on these 500 MHz MIPS routers which would finally have some decent throughput performance. #tinc or even worse #OpenVPN just did not cut it speed wise back then. And all other #Linux kernel solutions back then had major drawbacks (like not working with NAT if I recall correctly)