We study a binary non-additive hard-sphere mixture with square well interactions onlybetween dissimilar particles. An appropriate choice of the inter-particle potentialparameters favors the formation of equilibrium structures with tetrahedral ordering(Zaccarelli et al 2007 J. Chem. Phys. 127 174501). By performing extensive event-drivenmolecular dynamics simulations, we monitor the dynamics of the system, locating theiso-diffusivity lines in the phase diagram, and discuss their location with respect to thegas–liquid phase separation. We observe the formation of an ideal gel which continuouslycrosses towards an attractive glass upon increasing the density. Moreover, we evaluate thestatistical properties of the potential energy landscape for this model. We find that theconfigurational entropy, for densities within the optimal network-forming region, isfinite even in the ground state and obeys a logarithmic dependence on the energy.