ZyXEL FSG2200HNU User Guide - Page 128
NAT Technical Reference, 8.3.1 NAT Definitions
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Chapter 8 Network Address Translation (NAT) Table 37 Port Forwarding Edit (continued) LABEL DESCRIPTION External End Port Enter the last port of the original destination port range. To forward only one port, enter the port number in the External Start Port field above and then enter it again in this field. Internal Start Port Internal End Port Protocol Type Back Apply Cancel To forward a series of ports, enter the last port number in a series that begins with the port number in the External Start Port field above. Enter the port number here to which you want the ZyXEL Device to translate the incoming port. For a range of ports, enter the first number of the range to which you want the incoming ports translated. Enter the last port of the translated port range. Select the protocol supported by this virtual server. Choices are TCP, UDP, or TCP/UDP. Click Back to return to the previous screen. Click this to save your changes back to the ZyXEL Device. Click this to begin configuring this screen afresh. 8.3 NAT Technical Reference This section provides some technical background information about the topics covered in this chapter. 8.3.1 NAT Definitions Inside/outside denotes where a host is located relative to the ZyXEL Device, for example, the computers of your subscribers are the inside hosts, while the web servers on the Internet are the outside hosts. Global/local denotes the IP address of a host in a packet as the packet traverses a router, for example, the local address refers to the IP address of a host when the packet is in the local network, while the global address refers to the IP address of the host when the same packet is traveling in the WAN side. Note that inside/outside refers to the location of a host, while global/local refers to the IP address of a host used in a packet. Thus, an inside local address (ILA) is the IP address of an inside host in a packet when the packet is still in the local network, while an inside global address (IGA) is the IP address of the same inside 128 FSG2200HNU User's Guide