DQ Technology, Inc. / VisionNet
Page 64
M605N User Manual Revision 3.1
Section 6.2 – Port Triggering
DEFINITION OF PORT TRIGGERING
Port Triggering is a dynamic version of Port Forwarding, in which the modem will dynamically create a temporary port
forwarding rule based upon outbound activity. This is best applied for LAN devices that communicate with a remote
server. Basic VPN functions are already supported by default, but some applications use non-‐standard communication
methods.
An example would be port triggering configuration for the Nortel Contivity VPN Solution, which uses non-‐standard port
VPN ports and requires Port Triggering to work.
The following are the port triggering rules required for Nortel Contivity VPNs.
Port Triggering for
Nortel Contivity
VPNs
LAN Device
Outbound Port
Outbound
Protocol
Port Temporarily Forwarded to
Initiating LAN Device
Inbound
Protocol
500
TCP/UDP
500
TCP/UDP
10001
TCP/UDP
10001
TCP/UDP
In this scenario, a LAN Device (ie: The end-‐user’s laptop) will make an outbound UDP request on ports 500 and 10001. The
modem responds to this by temporarily forwarding ports 500 and 10001 to the IP address of the initiating LAN Device (ie:
The end-‐users laptop) for the life of the session.
Port Triggering is ideal for portable devices (ie:laptops, PDAs, etc) which require port forwarding, but for which a Static
LAN IP would be antithetical to the device’s common usage.