The external conflict is between Rainsford and General Zaroff. This conflict is most clear when Zaroff is hunting Rainsford. Rainsford, in order to live, must outwit Zaroff. This is obviously a conflict. There was also a lesser conflict as Rainsford resisted Zaroff's efforts to get him to be a hunter.
The internal conflict is within Rainsford as he is being hunted. He is having to fight with himself to keep himself from despairing and giving up. His situation seems hopeless and so it is hard for him to keep fighting for his life.
source: I read the book
