Which classes can attack during/contrl DR and DEF UP?

Off the top of my head...cannoneers, mechs, corsairs, kaiser, db, shadower, post red mm, current bm, all adv mages, AB after soul seeker fix, evan, merc, and probably more including zero.

Fyi: All summons ignore dr. Kaiser is the only class capable of bypassing for periods of time with his whole skill set. A few skills can bypass dr otherwise (mage auras i think, flame meggido, etc) but it isn't anywhere on that level of dps so.