ZyXEL P-794H User Guide - Page 194

Chapter 15 Security Table 89 Security Logging Configuration (continued) LABEL DESCRIPTION State Click Disable if you want to disable the logging. Click Enable if you want to ensable it. Level Select the severity level of logs that you want to record. Click Change to save your settings and refresh the screen. Output to Click Console to save the log outputs to the console. 15.3 Technical Reference This section provides some technical background information about the topics covered in this chapter. 15.3.1 NAT Definitions Inside/outside denotes where a host is located relative to the P-794H, 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 90 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. NAT never changes the IP address (either local or global) of an outside host. 194 P-794H User's Guide