Firewall
Port Range Triggering Configuration
Cisco RV132W ADSL2+ Wireless-N and RV134W VDSL2 Wireless-AC VPN Router Administration Guide
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5
STEP 4
In the
End
field, specify the port number that ends the range of ports to forward.
STEP 5
From the
Protocol
drop-down list, select a protocol (
TCP
,
UDP
, or
TCP
&
UDP
)
STEP 6
In the
Interface
drop-down list, select
DSL_ATM_WAN, DSL_PTM_WAN,
ETH_WAN, or USB_WAN
.
STEP 7
In the
IP Address
field, enter the IP address of the host on the LAN side to which
the specific IP traffic will be forwarded.
STEP 8
In the
Enable
field, check the
Enable
box to enable the rule.
STEP 9
Click
Save
.
Port Range Triggering Configuration
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.
NOTE
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.
