Yes, permission is necessary from the DI in order to pursue B.Ed from IGNOU or from any other university through ODL mode. This is as much for service benefits as it is for getting necessary leave for exams as well as attending workshops. However, the DI can only issue the necessary permission. The leave taken will have to be sanctioned by the concerned secondary board and a resolution taken to that effect. The Secretary of the concerned board will have to sign the format for leave availed during the course.
As far as M.Ed is concerned, no permission from the DI is necessary for this. A simple NOC from the MC is enough as M.Ed does not have any service benefits for a school teacher. However, in this case no official leave can be availed by a candidate. The leave for exam workshops etc, will be directly deducted from the leave(CL, ML etc) available to him. The MC shall sanction this.