D-Link DI-604 - Manual (Page 36)

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on the Broadband Router to not respond to ping commands. Pinging
public WAN IP addresses is a common method used by hackers to test
whether your WAN IP address is valid.
Discard PING from WAN side: By enabling this option, the DI-604 will not
reply to ping (ICMP) request packets from the Internet.
VPN Pass-Through
The Broadband Router supports VPN (Virtual Private Network)
pass-through for both PPTP (Point-to-Point Tunneling Protocol) and IPSec
(IP Security). Once VPN pass-through is enabled, there is no need to
open up virtual services. Multiple VPN connections can be made through
the Broadband Router. This is useful when you have many VPN clients on
the LAN network.
STATUS > DEVICE INFORMATION
This page displays the current information for the Broadband Router. It will