Various traffic filters can be found in the Firewall group although the General page offers some settings related to accessing the router from the outside. You can allow pinging the router’s WAN port and accessing the setup manager via that port. You can enable protection against DoS attacks but you cannot set any parameters of that protection.
The URL Filter can block traffic from specific external addresses by keywords. Scheduled filtering is possible, too.
The MAC Filter can block traffic from LAN devices with specific MAC addresses. You can choose the devices on this page.
The LAN to WAN Filter can block data transfers between any two devices one of which resides on the LAN and another, on the WAN.