Configuring Port Range Triggering - Cisco RV215W Administration Manual

Configuring the Firewall
Configuring Port Forwarding
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Cisco RV215W Wireless-N VPN Firewall Administration Guide
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Configuring Port Range Triggering

Port triggering allows devices on the LAN or DMZ to request one or more ports to
be forwarded to them. Port triggering waits for an outbound request from the LAN/
DMZ on one of the defined outgoing ports, and then opens an incoming port for
that specified type of traffic.
Port triggering is a form of dynamic port forwarding while an application is
transmitting data over the opened outgoing or incoming ports. Port triggering
opens an incoming port for a specific type of traffic on a defined outgoing port.
Port triggering is more flexible than static port forwarding (available when
configuring firewall rules) because a rule does not have to reference a specific
LAN IP or IP range. Ports are also not left open when not in use, which provides a
level of security that port forwarding does not offer.
Port triggering is not appropriate for servers on the LAN, since there is a
dependency on the LAN device making an outgoing connection before incoming
ports are opened.
Some applications require that, when external devices connect to them, they
receive data on a specific port or range of ports in order to function properly. The
router must send all incoming data for that application only on the required port or
range of ports. The gateway has a list 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.
To add a port triggering rule:
Choose Firewall > Port Range Triggering.
In the Application field, enter the name of the application for which to configure
port forwarding.
In the Triggered Range fields, enter the port number or range of port numbers that
will trigger this rule when a connection request from outgoing traffic is made. If the
outgoing connection uses only one port, enter the same port number in both
fields.
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