If you want the router to participate in dynamic routing protocols such as RIP etc 
running on your network(s), you should enable this option. To enable the Dynamic 
Routing feature for the WAN side, select WAN. To enable this feature for the LAN 
and wireless side, select LAN&WLAN. To enable the feature for both the WAN and 
LAN, select Both. To disable the Dynamic Routing feature for all network 
interfaces, keep the default setting, Disable. 
Note:Dynamic Routing is not available in Gateway mode