`ssh` to my workstation over Internet

I have eero at home with eero plus subscription as I like the parental controls. To my delight, the subscription also comes with DDNS. I wanted to set it up so I can ssh to my workstation from a laptop from our town library or a coffee shop.

1. Enabled IP reservation and port forwarding. Eero has an article about how to do it. I picked port 8080 and kept the internal port to be 22, so that ssh lupan@localhost and ssh lupan@xxx.eero.online -p 8080 would both work (instead of typing -p 8080 always). Eero makes it very easy to configure in the app.
2. systemctl start sshd
3. ssh lupan@localhost and ssh lupan@xxx.eero.online -p 8080 both worked as expected