设置为exit-node，允许lan访问，通告子网192.168.21.0

sudo tailscale down
sudo tailscale set --advertise-exit-node --exit-node-allow-lan-access=true --advertise-routes=192.168.21.0/24

使用100.65.0.2作为exit node。

tailscale down
tailscale up --exit-node=100.65.0.2 --exit-node-allow-lan-access=true

出现下列内容，且CPU带宽高占用时：

dns udp query: waiting for response or error from [127.0.0.53]: context deadline exceeded

sudo tailscale set --accept-dns=false