@georgejhunt suggests some of the block_DNS and/or dns_jail_enabled code might be deprecated after Captive Portal stabilizes in coming weeks... e.g. if things like the transition from named/BIND to dnsmasq becomes more official? But let's get more input from @jvonau & @tim-moody, to better document these lines at the very minimum:

https://github.com/iiab/iiab/blob/master/vars/default_vars.yml#L108-L115

https://github.com/iiab/iiab/blob/master/vars/local_vars_min.yml#L55-L56
https://github.com/iiab/iiab/blob/master/vars/local_vars_medium.yml#L55-L56
https://github.com/iiab/iiab/blob/master/vars/local_vars_big.yml#L55-L56

Refs:

• Ongoing Captive Portal Improvements: Captive Portal improvements checklist #1182
• @tim-moody proposes to restructure dhcp_service & dhcp_service2 ? #1207 (comment) -> Revise dhcp_service & dhcp_service2 in network/tasks/* ? (Remove from network/defaults/main.yml ?) #1250