Killer dots of the Knight

Place the digits 1-6 in each row, column and 2x3 box without repetition. Cells separated by a knight's move (in chess) cannot contain the same digit. Clues outside the grid give the sum of the digits on the indicated diagonal. Digits may repeat (if allowed by other rules). Digits in a dotted cage cannot repeat and must sum to the given total in the top left corner of the cage. Digits separated by a black dot have a 1:2 ratio.