ZyXEL P-2601HN-F1 User Guide - Page 154
Technical Reference, 11.4.1 NAT Definitions, Table 37
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Chapter 11 Network Address Translation (NAT) The following table describes the fields in this screen. Table 37 Network Setting > NAT > Sessions LABEL MAX NAT Session DESCRIPTION Use this field to set a common limit to the number of concurrent NAT sessions each client computer can have. Apply Cancel If only a few clients use peer to peer applications, you can raise this number to improve their performance. With heavy peer to peer application use, lower this number to ensure no single client uses too many of the available NAT sessions. Click Apply to save your changes. Click Cancel to restore your previously saved settings. 11.4 Technical Reference This section provides some technical background information about the topics covered in this chapter. 11.4.1 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 host when the packet is on the WAN side. The following table summarizes this information. Table 38 NAT Definitions ITEM Inside DESCRIPTION This refers to the host on the LAN. Outside This refers to the host on the WAN. Local This refers to the packet address (source or destination) as the packet travels on the LAN. Global This refers to the packet address (source or destination) as the packet travels on the WAN. 154 P-2601HN(L)-F1 Series User's Guide