Qantas Wifi and Docker

I’m currently in the air and spent ages trying to figure out why I could connect to the in-flight wifi but not trigger the captive portal.

It was Docker.

The in-flight wifi shares an address space with docker’s defaults.

172.18.0.0/23

It did not occur to me that the br network sharing this was from Docker. Instead I spent a bit of time trying to manually remove it, and more time still curl‘ing and pinging the gateway to reverse engineer the portal URL.

In the end a docker system prune -af did the trick and immediately fired the captive portal.

Tags:

#captive-portal #qantas #networking #docker