Motorola 2200 - Manual (Page 50)

Administrator’s Handbook
50
Trigger Por ts for wards a range of por ts 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 por ts 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 por t number or packet protocol an in-bound application might
use. For example, some network games select arbitrar y por t 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 por t 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.
Click the Next button, and your choice will be so designated.