''It was occupied by the forces of the Kirin Tor who are friendly with the Alliance.''
The town absolutely had contact with Dalaran since it was on their orders the town was occupied.
Also, it was purely a peacekeeping mission
''Dalaran soldiers protected the inhabitants from the Forsaken and the forest's other dangers. Ambermill was a haven for the Dalaran wizards who frequently survey the forest.''
http://wow.gamepedia.com/Ambermill