D-Link DSR-500N User Manual download pdf (Page 103)

Unified Services Router User Manual

101

Figure 62: Passthrough options for VPN tunne ls

5.8 Application Rules

Advanced > Application Rules > Application Rules

Application rules are als o referred to as p ort triggering. This feature allows devices

on the LAN or DMZ to reques t one or more ports to be forwarded to them. Port

triggering waits for an outbound reques t from the LAN/DMZ on one of the defined

outgoing ports, and then opens an incoming port for that s pecified type of traffic. This

can be thought of as a form of dynamic port forwarding while an application is

trans mitting data over the opened outgoing or incoming port(s ).

Port triggering application rules are more flexible than s tatic port forwarding that is

an available option when configuring firewall rules . This is becaus e a port triggering

rule does not have to reference a s pecific LAN IP or IP range. As well ports are not

left open when not in us e, thereby providing a level of s ecurity that port forwarding

does not offer.

 Port triggering is not appropriate for s ervers on the LAN, s ince there is a

dependency on the LAN device making an outgoing connection bef ore incoming

ports are opened.

Some applications require that when external devices connect to them, they receive

data on a s pecific port or range of ports in order to function properly. The router mus t

send all incoming data for that application only on the required port or range of ports.

The router has a lis t of common applications and games with corresponding outbound

and inbound ports to open. You can also specify a port triggering rule by defining the

type of traffic (TCP or UDP) and the range of incoming and outgoing ports to open

when enabled.

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D-Link DSR-500N User Manual Page 103