How to set up Alpine as a wireless router

From Alpine Linux

Pi Zero W Wireless Router

This is a page to describe building a Wireless Access Point with two wired ethernet ports for building a home router that connects to the internet with one wired port, and internal Lan with the second wired port and the on-board WiFi.

References

udhcpc
ez-ipupdate
Dynamic_DNS
Alpine Linux Bridge
Connect to wireless AP
dnsmasq listen restrictions

Pi Specific

Pi Wifi Repeater
WiFi Bridge

Not Related, but Interesting

AP and Managed Mode
AP and MQTT