Nahm's equations, N=1* domain walls, and D-strings in AdS(5) x S-5

We consider the following two problems: classical domain walls in the N = 1 * mass deformation of the maximally supersymmetric Yang Mills theory, and D -strings as external magnetic sources in the context of the AdS/CFT corresp ondence. We show that they are both described by Nahm's equations with unco nventional boundary conditions, and analyze the relevant moduli space of so lutions. We argue that general 'fuzzy sphere' configurations of D-strings i n AdS(5) correspond to Wilson-'t Hooft lines in higher representations of t he dual SU(n) gauge theory.