Disclaimer :: the information in this post was altered in order to avoid disclosing the real details of our internal network.
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I wanted to change my LAN domain to srv.dth. All devices connected to my network must resolve this domain automatically and certain devices will have their own FQDN, like: printer.srv.dth.
domain: srv.dth
network: 10.0.0.0
host: hs.srv.dth // "home server", machine where the DNS server will run
host IP: 10.0.0.10
devices:
router.srv.dth // ISP router
router1.srv.dth // Home network
router2.srv.dth // Lab
hs.srv.dth // DNS server
printer.srv.dth // Printer
cam0.srv.dth // Security cameras
cam1.srv.dth
cam2.srv.dth