Edimax Technology 3G-6200Wg - Manual (Page 77)

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automatically and access the Internet through this router
without any configuration. The NAT Traversal function
provided by UPnP can let applications that support UPnP
smoothly connect to Internet sites without any
incompatibility problem due to the NAPT port translation.
ALG Setting
You can let special applications that require “Application
Layer Gateway” to be supported here.
Static Routing
You can disable NAT function and setup the routing rules
manually.
Click on one of the above NAT selections and proceed to the manual's
relevant sub-section.