NetExp: Post-mortem on VXLAN overlay and Post-Quantum Encryption

Tldr; Tailscale will flap between Clearnet and other tunnels. It is generally not a good idea to overlay tunnels over Tailscale. So one day I was deploy LUX node using VXLAN overlay Tailscale on a minipc (refer to Homelab page) and the fan started going furrrrr then quiet on repeat. Something is wrong. I went on debug adventure, CPU spike every 1 minute. htop shows BIRD and Tailscale are the…