# Adding routes for IPS engines and Layer 2 Engines

Typically, only a default route through a Normal Interface is needed for IPS engines and Layer 2 Engines.

You might need to define a default route through a Normal Interface if SMC components are not on a directly connected network or if the Security Engine opens connections to a network that is not directly connected. You might need to add additional routes if one or more SMC components are not directly connected and cannot be reached through the default gateway. Capture Interfaces and Inline Interfaces on IPS engines and Layer 2 Engines do not have IP addresses. It is not possible to configure routing for these interfaces. You do not need to define routes if an IPS engine or Layer 2 Engine communicates only in its local IP network.