ICANN have locked the name .internal for private network use. Not sure why .lan is needed.
https://www.icann.org/en/board-activities-and-meetings/mater...
.lan is shorter, and has been widely used for many years (since before .internal or .home.arpa were "standardized")
.lan is shorter, and has been widely used for many years (since before .internal or .home.arpa were "standardized")