Gateway none - Manual (Page 62)

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CHAPTER 4
4.3.7.4 Enabling Special Applications
Some applications require multiple connections, such as
Internet gaming, videoconferencing, Internet telephony and
others. These applications may not work when Network
Address Translation (NAT) is enabled. If you need to run
applications that require multiple connections, use the fol-
lowing screen to specify the additional public ports to be
opened for each application.