Motorola Netopia 3397GP Administrator's Handbook page 50

Administrator's Handbook
Trigger Ports forwards a range of ports to an IP address on the LAN only after specific outbound traffic
"triggers" the feature. Enter the following information:
❑ Service Name: A unique identifier for the Custom Service.
❑ Global Port Range: Range of ports on which incoming traffic will be received.
❑ Local Trigger Port: Port number of the type of outbound traffic that needs to happen (will be the
trigger) to then allow the configured ports for inbound traffic.
Example: Set the trigger port to 21 and configure a range of 25 – 110. You would need to do an out-
bound ftp before you were able to do an inbound smtp.
Click the Next button.
Static NAT
This feature allows you to:
❑ Direct your Gateway to forward all externally initiated IP traffic (TCP and UDP protocols only) to a
default host on the LAN.
❑ Enable it for certain situations:
– Where you cannot anticipate what port number or packet protocol an in-bound application might
use. For example, some network games select arbitrary port numbers when a connection is opened.
– When you want all unsolicited traffic to go to a specific LAN host.
This feature allows you to direct unsolicited or non-specific traffic to a designated LAN station. With NAT
"On" in the Gateway, these packets normally would be discarded.
For instance, this could be application traffic where you don't know (in advance) the port or protocol
that will be used. Some game applications fit this profile.
From the pull-down menu, select the address of the PC that you want to be your default NAT destina-
tion.
Next
Click the button, and your choice will be so designated.
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