Local DNS not resolving [closed]

Question

Simplified version of my setup is as follows:

• pi-hole also serving as local dns
• Asus RT-AC68U resolving dns to pi-hole
• my nas with the local adress nas.lan
• macbbook using Big Sur where I experience my problems

The real problem for me occurs during node development involving local servers but these examples describes the problem.

What doesn't work

Safari can't find http://nas.lan:5000

The below node.js - script (ENOTFOUND error)

var dns = require('dns');
dns.lookup('nas.lan', function(err, res, fam){console.log(err, res, fam);})

What does work

Both on Chrome and EdgeChrome http://nas.lan:5000 resolves without problems.

Also nslookup nas.lan works without problem.

So, what should I do so that my local dns always works?

Answer 1

Additional googling with new keywords helped me out.

Disabling the DHCP server on Asus RT-AC68U while enabling the DHCP on my pihole resolved this immediately.