D-Link DIR-825/AC User Manual page 127

DIR-825/AC Wireless AC1200 Dual Band Gigabit Router with
3G/LTE Support and USB Port
User Manual
Parameter
NAT
Firewall
Ping
When all needed settings are configured, click the Apply button.
Select the checkbox if you want one WAN IP address to be used for
all computers of your LAN.
Select the checkbox to enable protection against ARP and DDoS
attacks.
Select the checkbox to allow the router to answer ping requests from
the external network through this connection. For security reasons,
it is recommended not to select this checkbox.
Page 127 of 257
Configuring via Web-based Interface
Description