Instances: tt.instances,
				Configs:   tt.configs,
				MeshConfig: func() *meshconfig.MeshConfig {
					m := mesh.DefaultMeshConfig()
					if tt.disableInboundPassthrough {
						m.InboundTrafficPolicy.Mode = meshconfig.MeshConfig_InboundTrafficPolicy_LOCALHOST
					}
					return m
				}(),
			})
			sim := simulation.NewSimulationFromConfigGen(t, s, s.SetupProxy(tt.proxy))